Daily Activities

Playing Guitar

Guitar playing demands fine motor control from the forearm flexors and extensors that drive finger movement on the fretboard. The fretting hand works harder than the strumming hand, with sustained isometric grip from the forearm muscles. The shoulders and upper traps hold the arms in position, often leading to tension in the neck and upper back.

Primary Muscles

forearms

Supporting Muscles

shoulderstrapsneckbiceps

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.

Supporting Muscles

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 Back

Ascending part of left trapezius

Upper fibers of left trapezius elevate and retract scapula for shrugs and pulls. Key for posture and overhead strength. Left-side focus corrects imbalances.

Neck

Ascending part of right trapezius

The ascending part of the right trapezius is the uppermost portion of the trapezius muscle on the right side, running from the base of the skull and upper cervical spine up toward the clavicle and shoulder. It elevates the scapula (shoulder blade) and assists in neck extension and rotation, crucial for shrugging movements and maintaining upright posture during lifts. Strong ascending traps prevent neck strain in overhead presses and rows.

Upper Back

Descending part of left trapezius

The descending part of the left trapezius fibers run downward from neck to scapula on the left side, aiding scapular depression and upward rotation. Key for pull-ups and lat work, preventing shoulder hike.

Upper Back

Descending part of right trapezius

The descending part of the right trapezius fibers slope from occiput to right scapula, depressing and upwardly rotating the scapula. Essential for balanced shoulder mechanics in bilateral lifts.

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.

Upper Back

trapezius

The trapezius is your large, diamond-shaped upper back muscle from neck to mid-back and shoulders. It elevates, retracts, and depresses the scapulae for shrugging, pulling, and posture. Essential for overhead lifts, neck stability, and preventing rounded shoulders.

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.

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.

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.