Martial Arts

Jiu-Jitsu

Brazilian Jiu-Jitsu is a grappling art that heavily loads the grip, hips, and posterior chain. Guard work demands strong adductors and hip flexors, while passing requires explosive quadriceps and core. The forearms fatigue rapidly from gi grips, and the neck resists chokes and cranks under constant pressure.

Primary Muscles

forearmsgluteshamstringsabdominals

Supporting Muscles

adductorsquadricepsshouldersbicepsnecklower backlatschest

Primary Muscles

Hand

Abductor digiti minimi of left hand

Located in the pinky side of the left palm, this muscle fans out the little finger for grip adjustments in sports or tools. It supports fine motor control and power grip stability. Climbers and grip athletes rely on it for pinky strength.

Hand

Abductor digiti minimi of right hand

In the right hand's hypothenar area, this muscle abducts the pinky finger, enhancing grip width for tools or sports. Crucial for musicians and weightlifters needing precise finger spread. Builds hand endurance.

Hand

abductor pollicis brevis

The thenar muscle at the thumb base abducts the thumb for pinch grips and opposition. Essential for fine tasks like texting or tools. Thumb trainers value it for dexterity.

Forearm

abductor pollicis longus

This forearm muscle runs to the thumb base, abducting and extending it for radial deviation. Vital for wrist stability in lifts like deadlifts. Forearm specialists train it for grip resilience.

Hand

adductor pollicis

Deep thumb adductor pulls thumb toward palm for key pinch strength. Vital for gripping keys or tools. Handstrength pros train it hard.

Forearm

brachioradialis

The brachioradialis is the thick forearm muscle on the radial (thumb) side, visible in hammer curls. It flexes the elbow in neutral grip, stabilizing during pulls and carries. Builds Popeye forearms for grip strength.

Forearm

extensor carpi radialis brevis

The ECRB is a forearm extensor on the radial side, extending and abducting the wrist. Mid-forearm location builds wrist stability for racquets and grips.

Forearm

extensor carpi radialis longus

The ECRL is the longer radial wrist extensor, more proximal in forearm for powerful extension and abduction. Stabilizes in heavy pulls.

Forearm

extensor carpi ulnaris

The ECU is the ulnar (pinky) wrist extensor in posterior forearm, balancing extension with deviation. Key for stability in sports.

Forearm

extensor digiti minimi

The EDM is a thin forearm muscle specifically extending the pinky finger at knuckles and wrist. Lies ulnar to EDM, aids fine grip control.

Forearm

extensor digitorum

The extensor digitorum is the central posterior forearm muscle, extending fingers 2-5 at knuckles and wrist. Fan-like tendons create dorsal hand ridges for grip extension.

Forearm

extensor indicis

The extensor indicis is a narrow forearm muscle that specifically extends the index finger (pointer finger), independent of the other fingers. It's essential for precise gripping and pointing motions in sports like tennis or climbing. Fitness pros value it for finger independence in grip training.

Forearm

extensor pollicis brevis

The extensor pollicis brevis sits in the forearm and extends the thumb at its base (metacarpophalangeal joint). It powers thumb opposition and pinch grips vital for weightlifting and climbing. For fitness, it's key in maintaining thumb stability during heavy pulls.

Forearm

extensor pollicis longus

Running deep in the forearm, the extensor pollicis longus straightens the thumb's end joint and adducts it. It's crucial for power grips in deadlifts and pinch strength. Athletes train it for thumb endurance in prolonged holds.

Forearm

flexor carpi radialis

Flexor carpi radialis is a forearm muscle that flexes and abducts the wrist toward the thumb side. Vital for hammering motions, pull-ups, and racket swings. Fitness staple for wrist strength in gymnastics and weights.

Hand

Flexor digiti minimi brevis of left hand

In the left hand's hypothenar eminence, this muscle flexes the pinky finger at its base for power grips. Key for musicians and rock climbers needing pinky strength. Enhances grip variety in fitness.

Hand

Flexor digiti minimi brevis of right hand

Right hand hypothenar muscle flexing pinky MCP joint for grip power. Essential for right-handed tools.

Lower Leg

flexor digitorum longus

The flexor digitorum longus is a powerful muscle in the deep posterior compartment of the lower leg, running from the tibia down to the toes. It flexes the four smaller toes and assists in plantarflexion at the ankle, helping with push-off during walking, running, and jumping. Strong flexors like this are crucial for balance, propulsion, and preventing foot drop in athletes.

Forearm

flexor digitorum profundus

Located in the deep anterior forearm, the flexor digitorum profundus flexes the distal joints of fingers 2-5, enabling a strong grip. It's vital for power activities like rock climbing, weightlifting, or crushing a grip trainer. Weakness here leads to dropped fingers and poor hand function.

Forearm

flexor digitorum superficialis

This superficial forearm muscle flexes the middle joints of fingers 2-5, key for precise hand control in sports like tennis or guitar playing. It sits in the anterior forearm, aiding in everything from typing to throwing. Balanced strength prevents imbalances with extensors.

Hand

flexor pollicis brevis

This thumb muscle in the thenar eminence flexes the thumb's base, critical for pinching and precision grips like turning keys or holding tools. It's key for hand strength in weightlifting or racket sports. Imbalances lead to thumb weakness.

Forearm

flexor pollicis longus

Deep in the anterior forearm, flexor pollicis longus flexes the thumb's tip joint, powering thumbs-up gestures and strong grips. Vital for tools, phones, and sports requiring thumb control. Essential for fine motor strength.

Hand

Flexor retinaculum of left wrist

The flexor retinaculum (transverse carpal ligament) is a thick band across the palmar wrist forming the carpal tunnel roof. It holds flexor tendons in place during wrist motion, vital for grip strength in fitness. Imbalances affect hand endurance.

Hand

Flexor retinaculum of right wrist

The right wrist's flexor retinaculum secures flexor tendons through the carpal tunnel, enabling smooth wrist flexion in daily and athletic tasks. It supports grip integrity during pulls and presses. Dysfunction leads to hand fatigue.

Forearm

Humeral head of left flexor carpi ulnaris

The humeral head of the left flexor carpi ulnaris is the upper arm-origin portion of this forearm muscle on your left side, running from the inner elbow down to your wrist. It flexes and adducts the wrist, stabilizing it during gripping and weight-bearing activities. Strong FCU matters for forearm endurance in sports like tennis or climbing.

Forearm

Humeral head of left pronator teres

The humeral head of the left pronator teres originates from your left inner elbow and crosses to the mid-forearm, rotating the forearm palm-down. It's key for turning motions in daily tasks and sports like golf or throwing. Building it prevents forearm fatigue and rotation imbalances.

Forearm

Humeral head of right flexor carpi ulnaris

The humeral head of the right flexor carpi ulnaris starts at the inner elbow on your right side and runs to the wrist, enabling wrist bend and pinky-side tilt. Vital for right-handed grip strength in tools, weights, or racquets. It supports unilateral forearm power in asymmetric training.

Forearm

Humeral head of right pronator teres

This right-side humeral head of pronator teres links inner right elbow to mid-forearm, powering palm-down rotation for throwing, swinging, or tool use. Essential for right-dominant athletes to balance forearm rotators and avoid overuse.

Foot

Opponens digiti minimi of left foot

Small intrinsic foot muscle opposing pinky toe for transverse arch stability. Aids push-off in sprinting. Rarely isolated but supports forefoot dexterity in climbers.

Hand

Opponens digiti minimi of left hand

Hypothenar muscle opposing pinky finger to cup the palm for grip strength. Enhances power grip in weightlifting and climbing. Weakness affects fine motor tasks.

Foot

Opponens digiti minimi of right foot

The opponens digiti minimi is a small intrinsic muscle in the sole of the right foot that helps oppose the little toe against the other toes. It plays a key role in fine motor control for foot dexterity, which is vital for balance during activities like running on uneven terrain or gripping with toes in climbing. Fitness enthusiasts appreciate it for enhancing foot stability and preventing injuries in high-impact sports.

Hand

Opponens digiti minimi of right hand

This small muscle in the hypothenar eminence of the right hand enables opposition of the little finger, crucial for powerful grips like holding tools or barbells. It's essential for hand dexterity in weightlifting and climbing. Strengthening it improves overall grip strength and prevents hand fatigue.

Hand

opponens pollicis

The opponens pollicis sits at the base of the thumb in the thenar eminence, rotating the thumb to oppose the fingers for pinching and gripping. Vital for weightlifters handling barbells or dumbbells securely. It enhances precision in fitness activities like kettlebell work.

Forearm

palmaris longus

The palmaris longus is a slender forearm muscle running from elbow to palm, aiding wrist flexion and tensing the palmar aponeurosis for grip. Absent in 14% of people, it's key for climbers and grip athletes. It contributes to forearm endurance in pulling exercises.

Forearm

pronator quadratus

Deep forearm muscle between radius/ulna pronating the forearm (palm down) for screwdriver grips. Key for wrist stability in deadlifts. Enhances rotational forearm strength.

Hand

Set of dorsal interossei of left hand

These four small fan-shaped muscles on the back of the left hand abduct the fingers away from the middle finger. They work with other intrinsics for fine motor control and grip strength. Important for grip-intensive fitness like climbing or weightlifting.

Hand

Set of dorsal interossei of right hand

These four small fan-shaped muscles on the back of the right hand abduct the fingers away from the middle finger. They enable precise finger spreading and grip control. Crucial for hand-intensive sports and weight training.

Hand

Set of lumbricals of left hand

Worm-like muscles in left hand palm flexing knuckles while extending fingers for writing/gripping. Essential for fine motor fitness tasks.

Hand

Set of lumbricals of right hand

Same as left but right hand; key for dexterity.

Hand

Set of palmar interossei of left hand

Three muscles in left palm adducting fingers toward middle. Grip power for fitness.

Hand

Set of palmar interossei of right hand

Right palm adductors for grip.

Forearm

supinator

The supinator wraps around the upper forearm, supinating (turning palm up) the radius over the ulna. Essential for twisting motions in sports and daily lifts. Key for forearm endurance in grip-heavy training.

Foot

Third lumbrical of left foot

The third lumbrical of the left foot is a small worm-like muscle flexing the proximal toes for balance. Specific to left foot 3rd-4th toe interspace. Aids push-off in running/squats.

Foot

Third lumbrical of right foot

The third lumbrical of the right foot flexes proximal and extends distal phalanges of 4th toe for propulsion. Right foot specific. Enhances foot stability in unilateral training.

Forearm

Ulnar head of left flexor carpi ulnaris

The ulnar head is the larger part of the left flexor carpi ulnaris, on the medial forearm flexing and adducting the wrist. Essential for grip strength, hammering, and racket sports. Balances forearm for injury prevention.

Forearm

Ulnar head of left pronator teres

The ulnar head forms the deep ulnar part of the left pronator teres, pronating the forearm (palm down). Key for twisting motions like turning doorknobs or tennis serves. Supports grip and elbow stability.

Forearm

Ulnar head of right flexor carpi ulnaris

The ulnar head is the main portion of the right flexor carpi ulnaris on inner forearm, flexing and ulnar deviating wrist. Vital for strong grips in pulls and sports.

Forearm

Ulnar head of right pronator teres

Ulnar head of right pronator teres deep in proximal forearm, drives pronation. Important for rotational power.

Hip

gemellus inferior

Small deep rotator in the hip, gemellus inferior laterally rotates and stabilizes the thigh. Works with piriformis in squats and pivots. Crucial for hip control in sports.

Hip

gemellus superior

Tiny hip muscle above ischial spine, gemellus superior laterally rotates femur. Assists in twisting sports and hip stability. Part of deep six rotators.

Hip

gluteus maximus

Largest hip muscle, gluteus maximus extends and externally rotates thigh for powerful hip thrust in squats, deadlifts, running. King of posterior chain.

Hip

gluteus medius

Side hip muscle for abduction and stabilization during single-leg stance in running, squats. Prevents Trendelenburg gait.

Hip

gluteus minimus

Deepest glute under medius, minimus abducts and internally rotates hip. Key stabilizer for balance in yoga, hiking.

Hip

piriformis

The piriformis is a deep hip rotator in the glutes, externally rotating the hip for balance in squats and deadlifts. Tightness often causes sciatica-like pain. Essential for hip mobility in athletes.

Hip

quadratus femoris

Deep hip external rotator between ischium/femur for leg stability in single-leg work. Prevents twisting injuries in sports.

Thigh

biceps femoris

The biceps femoris is the lateral hamstring on the back of the thigh, with long and short heads forming a thick band from hip to knee. It flexes the knee, extends the hip, and rotates the leg outward, vital for running, jumping, and deadlifts. Key for posterior chain power and injury prevention.

Thigh

gracilis

Long, thin medial thigh muscle adducting and flexing knee. Aids cutting movements in soccer, stabilizing in squats.

Lower Leg

popliteus

The popliteus is a small knee muscle behind the joint that 'unlocks' the knee from full extension for flexion. Crucial for downhill running and pivoting in sports. Prevents knee hyperextension.

Thigh

semimembranosus

The semimembranosus is a posterior thigh hamstring forming the teardrop at knee back, flexing knee and extending hip. Powers deadlifts, lunges, and deceleration in sports. Prevents ACL strains by stabilizing.

Thigh

semitendinosus

Semitendinosus is the slender medial hamstring with a long tendon, flexing knee and extending hip. Aids in medial knee stability for cutting sports. Complements semimembranosus for balanced posterior chain.

Abdomen

Diaphragm

The diaphragm is the dome-shaped breathing muscle separating chest from abdomen, contracting to inhale. Central tendon anchors it, essential for core bracing in lifts and endurance.

Pelvis

External anal sphincter

The external anal sphincter is a skeletal muscle ring around the anus that you can consciously control for bowel movements. It maintains continence during daily activities and is strengthened via Kegels for pelvic floor health. Important for athletes in high-impact sports to prevent incontinence.

Abdomen

external oblique

External obliques form the outer 'V' of your abs on each side, rotating and side-bending the torso while compressing the abdomen. They're powerhouse muscles for rotational power in sports like golf, boxing, and throws. Train them for a defined waist and core stability.

Hip

iliacus

The iliacus is the fan-shaped hip flexor filling your pelvis bowl, partnering with psoas to lift the thigh. Crucial for running, kicking, and rising from sits. Tight iliacus contributes to anterior pelvic tilt and lower back strain in fitness enthusiasts.

Abdomen

psoas major

The psoas major is a deep hip flexor from spine to thigh, lifting knees in running/squats. Core to posture and power; tightness causes low back pain.

Pelvis

pubococcygeus

Part of pelvic floor, the pubococcygeus supports bladder/bowel, aids continence and core stability. Crucial for intra-abdominal pressure in heavy lifts like squats.

Supporting Muscles

101

Hip

adductor brevis

Short inner thigh muscle adducts the thigh and assists rotation, key for lateral stability in squats and sprints. Middle adductor, it prevents groin pulls in dynamic sports. Essential for balanced leg power.

Hip

adductor longus

Prominent inner thigh muscle adducts and flexes the hip, powering lateral lunges and cutting moves. Prone to strains but key for athletic power. Gym staple for groin strength.

Hip

adductor magnus

Largest inner thigh muscle, with adductor and hamstring-like parts, adducts and extends hip powerfully. Mimics hamstring in deadlifts. Crucial for posterior chain balance.

Hip

adductor minimus

Small deep inner thigh muscle above magnus, aids adduction and rotation. Stabilizes hip in single-leg work. Often overlooked but prevents imbalances.

Thigh

gracilis

Long, thin medial thigh muscle adducting and flexing knee. Aids cutting movements in soccer, stabilizing in squats.

Hip

obturator externus

Deep hip external rotator and adductor originating from the pelvis obturator foramen. Stabilizes hip in deep squats and lateral movements. Often overlooked but prevents groin strains in agility training.

Hip

pectineus

The pectineus is a flat muscle on the inner upper thigh that flexes and adducts the hip, helping drive knees up in running or squats. It's crucial for lower body power in athletes. Tightness contributes to groin strain prevention.

Thigh

sartorius

The sartorius is the longest muscle in the body, spiraling from hip to inner knee, forming a 'tailor's muscle' for crossing legs. It flexes, abducts, and rotates the hip plus flexes the knee, key for soccer kicks and agility drills. Balances quad-dominant training.

Thigh

rectus femoris

The rectus femoris is the central quad muscle crossing both hip and knee, visible as the teardrop above your knee. It flexes the hip and extends the knee, powering sprints, jumps, and squats. Balanced development prevents knee pain in athletes.

Thigh

vastus intermedius

Deep central quad muscle under rectus femoris, extends knee powerfully. Core quad for squats and jumps.

Thigh

vastus lateralis

Largest quad on outer thigh, massive knee extender for lateral stability in lunges and sprints.

Thigh

vastus medialis

Teardrop inner quad (VMO) stabilizes patella, key for knee health in deep squats.

Upper Arm

coracobrachialis

The coracobrachialis is a small shoulder flexor deep in the upper arm, bridging coracoid to humerus. It flexes and adducts the arm, stabilizing shoulder in presses. Adds inner arm density for balanced delts.

Shoulder

deltoid

The deltoid is the rounded shoulder cap muscle with anterior, middle, and posterior fibers covering the shoulder joint. It abducts, flexes, and extends the arm for raises and presses. Builds the V-taper and protects the rotator cuff.

Shoulder

infraspinatus muscle

Infraspinatus caps the back of the shoulder blade, externally rotating the arm for throwing and serving. Key rotator cuff muscle for shoulder stability in presses and pulls.

Chest

serratus anterior

Serratus anterior wraps from ribs to scapula, protracting and upwardly rotating the shoulder blade for punches and presses. 'Boxer's muscle' prevents winging, crucial for overhead athletes.

Shoulder

subscapularis

The subscapularis is the anterior rotator cuff muscle filling the scapula's subscapular fossa. It internally rotates the arm and stabilizes the shoulder joint. Crucial for fitness in presses, pulls, and preventing dislocations.

Shoulder

supraspinatus

The supraspinatus tops the rotator cuff on scapula's fossa, initiating shoulder abduction. Vital for overhead presses and impingement prevention in weight training.

Shoulder

teres major

The teres major is a thick muscle from lower scapula to humerus, adducting and internally rotating the arm. 'Lat's little helper' for pulling exercises like rows and pull-ups.

Shoulder

teres minor

The teres minor is a narrow rotator cuff muscle on scapula's lateral border, externally rotating and stabilizing the shoulder. Key for throwing and pressing without winging.

Upper Arm

biceps brachii

The biceps brachii is the iconic front-of-arm muscle with two heads, located on the front of the upper arm from shoulder to elbow. It flexes the elbow and supinates the forearm, powering curls and underhand pulls. Essential for arm strength and aesthetics in any fitness routine.

Upper Arm

brachialis

The brachialis lies deep under the biceps in the lower front upper arm, the true powerhouse for elbow flexion. It works silently in every curl, providing thick arm mass without the peak. Crucial for heavy pulling and functional strength.

Neck

arytenoid cartilage

Paired laryngeal cartilages in throat enabling voice production via vocal cord movement. Not muscle but closest for neck; singers train supporting muscles. Vital for breathing/speaking.

Neck

cervical rotator

Cervical rotators are deep neck muscles like obliquus capitis inferior and splenius cervicis that turn the head side-to-side. Located deep in the upper cervical spine, they enable rotation for looking over shoulder. Vital for neck mobility in sports and daily turns.

Neck

cricothyroid

The cricothyroid is a small intrinsic laryngeal muscle in the anterior neck, tensing vocal cords for higher pitch. Located between cricoid and thyroid cartilages, it's key for singing and speaking. Matters for vocal athletes like singers.

Neck

digastric

The digastric has anterior and posterior bellies under the jaw, opening the mouth by depressing mandible. Runs from mandible to mastoid via sling, key for chewing and yawning.

Head

genioglossus

Fan-shaped tongue muscle from chin to tongue base, genioglossus protrudes and depresses tongue. Vital for swallowing, speech, and breathing in fitness vocal training.

Neck

geniohyoid

Thin neck muscle under chin pulling hyoid forward/up, geniohyoid aids swallowing and tongue movement. Supports neck stability in planks.

Neck

hyoglossus

The hyoglossus is a thin tongue muscle running from the hyoid bone (under chin) up into the tongue's side. It depresses and retracts the tongue, aiding swallowing and speech. Rarely targeted in fitness, but dysfunction affects eating and breathing mechanics.

Neck

iliocostalis cervicis

Iliocostalis cervicis is the neck portion of the erector spinae, running vertically along upper back to cervical ribs. It extends and laterally bends the neck, vital for posture in overhead lifts and sports. Supports head stability in fitness.

Head

inferior oblique

Inferior oblique is an eye muscle under the eyeball, rotating it up and out. Matters for gaze stability in dynamic sports; strains rare but affect tracking.

Neck

inferior pharyngeal constrictor

Inferior pharyngeal constrictor wraps lower throat, constricting for swallowing. Supports airway protection.

Neck

lateral crico-arytenoid

Lateral crico-arytenoid closes vocal folds for voice and swallow.

Neck

lateral thyrohyoid ligament

Lateral thyrohyoid ligament connects thyroid to hyoid, stabilizing hyoid in swallow. Not a muscle; passive.

Head

levator palpebrae superioris

The levator palpebrae superioris is a small muscle located above the eye within the orbit that elevates the upper eyelid. It plays a crucial role in opening the eyes for clear vision during workouts and daily activities. Fitness enthusiasts care about it because eyelid fatigue or weakness can impair focus during intense training sessions.

Neck

levator scapulae

The levator scapulae runs from the upper neck vertebrae to the top of the shoulder blade, lifting the scapula toward the head. It's key for shrugging motions and stabilizing the shoulder during overhead lifts. Gym-goers target it indirectly through shrugs and neck training to prevent shoulder hikes and imbalances.

Head

levator veli palatini

This small muscle in the side of the throat lifts the soft palate during swallowing and speech. It helps seal off the nasal cavity for proper voice resonance and prevents food from entering the nose. Relevant for singers or those doing breathwork in fitness to maintain clear airways.

Neck

longissimus capitis

Part of the erector spinae group, the longissimus capitis extends from the upper back along the neck to the skull, turning and tilting the head. It stabilizes the head during heavy lifts like deadlifts. Strong neck extensors prevent whiplash and support posture in athletes.

Neck

longissimus cervicis

This erector spinae muscle spans the neck vertebrae, extending and stabilizing the cervical spine. It keeps the head aligned during upright posture and dynamic movements like cleans. Vital for neck resilience in contact sports and heavy training.

Neck

longus capitis

A deep anterior neck flexor, the longus capitis flexes the head forward and stabilizes cervical vertebrae. It counters posterior muscles during neck crunches or wrestling bridges. Key for balanced neck strength and preventing forward head posture.

Neck

longus colli

The longus colli is the primary deep neck flexor, spanning all cervical vertebrae to flex and stabilize the neck. Crucial for chin tucks and preventing slouched posture in long training sessions. Builds neck endurance for grapplers and cyclists.

Neck

Median thyrohyoid ligament

Not a muscle but a ligament connecting thyroid and hyoid bones in the midline neck, it supports hyoid elevation during swallowing. Indirectly aids strap muscles in fitness for better airway control. Rarely targeted but important for throat stability.

Neck

middle pharyngeal constrictor

This throat muscle constricts the pharynx during swallowing, forming the middle band around the airway. Supports powerful swallows in athletes consuming large meals or shakes. Maintains throat tone for vocal endurance.

Neck

mylohyoid

The mylohyoid forms the floor of the mouth, elevating the hyoid and floor during swallowing and speech. It supports tongue movement for chewing tough foods in bulking diets. Key for jaw stability in powerlifters.

Neck

oblique arytenoid

Paired muscles on the back of the larynx that close the vocal folds during phonation and protect airways. Aids forceful coughs and Valsalva in heavy lifts. Important for vocal control in coaches yelling sets.

Neck

obliquus capitis inferior

Deep suboccipital muscle rotating the atlas on axis for head turns. Stabilizes craniocervical junction during neck twists in sports. Critical for proprioception and dizziness prevention in rotational training.

Neck

obliquus capitis superior

Upper suboccipital extending and bending the head laterally while stabilizing occiput. Works with rotators for precise head control in aiming sports. Prevents atlanto-occipital instability.

Neck

omohyoid

Strap-like muscle with two bellies depressing the hyoid during swallowing and speech. Tautens neck skin and aids large bolus swallows in athletes. Prevents hyoid elevation overload.

Neck

platysma

The platysma is a thin sheet-like muscle under the chin and neck skin, depressing the jaw and lower lip for expressions. Helps in neck stability during shrugs. Fitness note: resists 'neck bands' with age.

Neck

posterior crico-arytenoid

The posterior crico-arytenoid is the sole abductor of the vocal folds, essential for breathing by opening the airway. Vital for singers and athletes needing vocal control. Weakness affects breathing endurance.

Neck

rectus capitis anterior

Short neck flexor at base of skull flexing upper cervical spine for head nod. Stabilizes head in shrugs, prevents forward head posture.

Neck

rectus capitis lateralis

Lateral upper cervical flexor stabilizing side-bending head for gaze control. Aids neck endurance in upright posture.

Neck

rectus capitis posterior major

The rectus capitis posterior major is a small deep neck muscle at the base of your skull, running from the upper cervical spine to the occiput. It extends and rotates the head, helping maintain upright posture during daily activities and workouts. Strong suboccipitals like this one prevent forward head posture common in desk workers and lifters.

Neck

rectus capitis posterior minor

This tiny deep neck muscle sits just below the occiput, connecting the atlas to the skull. It assists in head extension and rotation, crucial for stabilizing your head during heavy lifts or prolonged sitting. Weakness contributes to chronic neck stiffness in fitness enthusiasts.

Neck

scalenus anterior

The anterior scalene anchors from neck vertebrae to first rib, aiding neck flexion and arm elevation. It lifts the first rib during deep breaths, important for overhead athletes. Tension contributes to thoracic outlet issues.

Neck

scalenus medius

The middle scalene runs from cervical transverse processes to first rib, assisting neck lateral flexion and rib elevation. Crucial for breathing during intense workouts and shoulder stability. Often tight in cyclists and throwers.

Neck

scalenus posterior

The posterior scalene attaches lower cervical vertebrae to second rib, flexing neck and aiding inhalation. Supports posture in endurance sports by stabilizing ribs. Less commonly injured but tightens with chronic coughs.

Neck

semispinalis capitis

This thick muscle spans upper thoracic and lower cervical to occiput, extending and rotating the head. Buffers heavy axial loads in powerlifters and stabilizes during shrugs. Key for countering forward head in tech users.

Neck

semispinalis cervicis

The semispinalis cervicis runs from upper thoracic to cervical transverse processes, extending the neck. Supports head during upright posture and overhead presses. Vital for cervical stability in contact sports.

Neck

Set of anterior cervical intertransversarii

These small muscles run between the transverse processes of adjacent cervical vertebrae in the front of the neck. They assist in lateral flexion and slight rotation of the neck, helping maintain proper head alignment during movement. Fitness enthusiasts care because they support neck stability in exercises like overhead presses or deadlifts.

Neck

Set of interspinales cervicis

Tiny paired muscles between spinous processes of cervical vertebrae, aiding neck extension and stabilization. They help maintain posture during upper body lifts. Relevant for neck strength in fitness routines.

Neck

Set of posterior cervical intertransversarii

Back neck muscles between transverse processes for lateral flexion/rotation opposite to anterior.

Neck

splenius capitis

Broad muscle upper neck/shoulder blade extends/rotates head. Key for neck strength in presses.

Neck

splenius cervicis

Lower splenius extends/rotates cervical spine.

Neck

sternocleidomastoid

Prominent neck muscle turns/tilts head, flexes neck, aids breathing. Visible in fitness for posture/aesthetics.

Neck

sternohyoid

The sternohyoid is a thin, strap-like muscle in the anterior neck that runs from the sternum to the hyoid bone. It depresses the hyoid bone during swallowing and speaking, stabilizing the larynx. For fitness enthusiasts, it's key for neck stability in exercises like deadlifts or overhead presses, preventing strain during heavy breathing.

Neck

sternothyroid

The sternothyroid lies deep in the anterior neck, connecting the sternum to the thyroid cartilage. It depresses the larynx for swallowing and voice modulation. Fitness folks value it for neck resilience during compound lifts or contact sports.

Neck

stylohyoid

The stylohyoid is a slender muscle from the skull's styloid process to the hyoid bone in the upper neck. It elevates and retracts the hyoid during swallowing. Important for fitness in maintaining neck posture during dynamic movements like cleans.

Neck

stylohyoid ligament

The stylohyoid ligament is a fibrous band connecting the skull's styloid process to the hyoid bone, providing passive stability in the upper neck. It doesn't contract but supports hyoid movement during swallowing. Relevant for fitness in assessing neck tension from poor posture.

Neck

stylopharyngeus

The stylopharyngeus elevates the pharynx and larynx from the skull's styloid to the pharyngeal wall. It aids swallowing and speech by lifting the throat. Fitness relevance: supports airway patency during intense workouts.

Head

superior oblique

The superior oblique is an extrinsic eye muscle originating near the nose, passing through a pulley to depress and intort the eyeball. It controls downward/outward gaze. Fitness note: eye stability aids visual tracking in sports.

Neck

superior pharyngeal constrictor

The superior pharyngeal constrictor forms the upper pharynx wall, constricting to propel food during swallowing. Originates from skull base to pharynx. Supports safe swallowing in athletes under exertion.

Head

Tendon of right levator palpebrae superioris

The tendon of the right levator palpebrae superioris attaches the muscle to the eyelid, elevating the upper lid for vision. Specific to right eye. Aids blink-free focus in precision sports.

Neck

thyro-arytenoid

The thyro-arytenoid adjusts vocal ligament tension inside larynx for pitch. Key for vocal athletes like singers.

Neck

thyrohyoid

Thyrohyoid elevates thyroid or depresses hyoid for swallow. Short neck muscle.

Neck

thyrohyoid membrane

Fibrous sheet between thyroid and hyoid, stabilizing larynx.

Neck

Transverse arytenoid

The transverse arytenoid is a single small muscle between the arytenoid cartilages in your larynx (voice box). It pulls them together to close the vocal folds for phonation and swallowing. Vital for voice production and airway protection, though not directly trained in fitness.

Head

Trochlea of left superior oblique

The trochlea is a cartilage pulley at the medial eye socket for the left superior oblique muscle tendon. It redirects the tendon to enable eye intorsion, depression, and abduction. Critical for coordinated eye movements, though not a muscle itself.

Head

Trochlea of right superior oblique

The trochlea is a cartilage pulley at the medial orbit for the right superior oblique muscle tendon. It enables precise eye intorsion, depression, and abduction. Key for binocular vision coordination.

Head

Uvular muscle

The uvular muscle elevates the uvula (soft palate dangler) during swallowing and speech. Aids gag reflex and velopharyngeal closure. Minor role in fitness but key for swallowing.

Neck

Vertical intermediate part of left longus colli

Vertical intermediate fibers of left longus colli flex neck laterally and forward. Deep neck stabilizer for posture.

Pelvis

iliococcygeus

The iliococcygeus forms the back part of the pelvic floor, spanning from pelvis to tailbone, supporting organs and pelvic stability. Important for core integrity in heavy lifts and preventing incontinence. Weakness shows in squats or postpartum.

Lower Back

iliocostalis lumborum

Iliocostalis lumborum is the lumbar erector spinae muscle along the back, from iliac crest to lower ribs, maintaining upright posture and spinal extension. Critical for deadlifts, squats, and anti-rotation core work.

Upper Back

longissimus thoracis

The longest erector spinae muscle, running parallel to the spine from sacrum to mid-back, it extends the spine and maintains upright posture. Essential for deadlifts, squats, and spinal stability in powerlifting. Weakness leads to back rounding under load.

Lower Back

lumbar rotator

Lumbar rotators (multifidus and rotatores lumborum) are deep spinal muscles that rotate and stabilize individual lumbar vertebrae. They prevent twisting injuries during rotational lifts like Russian twists. Essential for core stability in CrossFit and golf swings.

Upper Back

semispinalis thoracis

Semispinalis thoracis is a deep erector spinae muscle from thoracic spine, extending the vertebral column. Maintains thoracic posture during deadlifts and rows. Prevents slouching in prolonged sitting.

Lower Back

serratus posterior inferior

Deep muscle from lower thoracic spine to lower ribs, draws ribs down and back for exhalation. Aids breathing in heavy lifts like deadlifts.

Lower Back

Set of interspinales lumborum

Small muscles between lumbar spinous processes that extend and stabilize the lower back. Key for spinal integrity during squats and deadlifts. Fitness pros target them for back health.

Upper Back

Spinalis

Medial erector spinae column spanning thoracic/cervical, extends spine unilaterally/ bilaterally. Core for upright posture in lifts.

Pelvis

Tendinous arch of levator ani

The tendinous arch of levator ani is a fibrous white line on the pelvic sidewall anchoring levator ani muscles for pelvic floor support. It transmits fascia for stability during lifts. Critical for core integrity in squats and deadlifts.

Chest

Abdominal part of left pectoralis major

The abdominal part of the left pectoralis major is the lower portion of the left chest's primary pushing muscle, attaching from the sternum down to the ribs near the abdomen. It drives shoulder adduction and flexion, crucial for powerful presses like bench variations and dips. Fitness enthusiasts target it for that defined lower chest line in bodybuilding.

Chest

Abdominal part of right pectoralis major

The abdominal part of the right pectoralis major forms the lower section of the right chest's main power muscle, spanning from the sternum to the abdominal ribs. It excels in adduction and flexion for presses and flyes, key for balanced chest development. Gym-goers love it for carving out that teardrop lower chest aesthetic.

Chest

Anterior papillary muscle of right ventricle

This cardiac muscle inside the right ventricle anchors mitral valve leaflets for proper heart pumping. Not skeletal, but endurance training optimizes heart efficiency. Matters for cardio performance indirectly.

Chest

Anterolateral head of lateral papillary muscle of left ventricle

Specialized head of left heart papillary muscle securing mitral valve for left ventricle ejection. Critical for oxygenated blood flow. Athletes benefit from cardiac hypertrophy here.

Chest

External intercostal muscle

External intercostals are thin muscles between the ribs that elevate them during inhalation, aiding deep breathing for core stability in lifts. They're vital for endurance athletes needing efficient oxygen uptake. Fitness training enhances respiratory muscle power.

Chest