Muscles/Forearm

Forearm

flexor digitorum profundus

FLEK-sor dij-ih-TOE-rum pro-FUN-dus

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.

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Common Pain & Injury

Pain manifests as deep aching in the forearm or finger tips, aggravated by gripping or finger bending. Overuse in sports like golf or typing can cause tendinopathy or trigger finger. Seek medical help if you can't fully extend fingers or have swelling/numbness.

Anatomy & Function

Origin

Proximal anterior and medial ulna and interosseous membrane (upper inner forearm bone)

Insertion

Distal phalanges of fingers 2-5 (tips of index to pinky fingers)

Actions

Distal interphalangeal joint flexion (bending fingertip joints)
Proximal interphalangeal joint flexion (middle finger joints)
Wrist flexion (bending wrist forward)

Innervation

Anterior interosseous and ulnar nerves

Muscle Relationships

Antagonists

Extensor digitorumExtensor indicis

Synergists

Flexor digitorum superficialisFlexor pollicis longus

Trigger Points

Form in the deep forearm muscle belly, referring pain to the fingertips, palm, and sometimes upper forearm.

Stretches

1Prayer stretch with finger extension

2Wrist flexor stretch

3Finger extensor glide

Common Conditions

Flexor digitorum profundus strainTrigger finger (stenosing tenosynovitis)Anterior interosseous syndrome

Anatomical Parts

Right flexor digitorum profundusLeft flexor digitorum profundus

FAQ

Flexor digitorum profundus function

It bends the tips of fingers 2-5 for strong gripping power.

Flexor digitorum profundus pain

Deep forearm ache from overuse; rest and grip strengthening resolve most cases.

How to stretch flexor digitorum profundus

Extend fingers back while stretching wrist in prayer position.

Flexor digitorum profundus injury

Common in climbers; involves tendon strain affecting finger flexion.

Exercises for flexor digitorum profundus

20

Bottoms-Up Clean From The Hang Position position 1

Bottoms-Up Clean From The Hang Position position 2

Bottoms-Up Clean From The Hang Position

intermediate·kettlebells

Cable Wrist Curl position 1

Cable Wrist Curl position 2

Cable Wrist Curl

beginner·cable

Dumbbell Lying Pronation position 1

Dumbbell Lying Pronation position 2

Dumbbell Lying Pronation

intermediate·dumbbell

Dumbbell Lying Supination position 1

Dumbbell Lying Supination position 2

Dumbbell Lying Supination

intermediate·dumbbell

Farmer's Walk position 1

Farmer's Walk position 2

Farmer's Walk

intermediate·other

Finger Curls position 1

Finger Curls position 2

Finger Curls

beginner·barbell

Kneeling Forearm Stretch position 1

Kneeling Forearm Stretch position 2

Kneeling Forearm Stretch

Palms-Down Dumbbell Wrist Curl Over A Bench position 1

Palms-Down Dumbbell Wrist Curl Over A Bench position 2

Palms-Down Dumbbell Wrist Curl Over A Bench

beginner·dumbbell

Palms-Down Wrist Curl Over A Bench position 1

Palms-Down Wrist Curl Over A Bench position 2

Palms-Down Wrist Curl Over A Bench

beginner·barbell

Palms-Up Barbell Wrist Curl Over A Bench position 1

Palms-Up Barbell Wrist Curl Over A Bench position 2

Palms-Up Barbell Wrist Curl Over A Bench

beginner·barbell

Palms-Up Dumbbell Wrist Curl Over A Bench position 1

Palms-Up Dumbbell Wrist Curl Over A Bench position 2

Palms-Up Dumbbell Wrist Curl Over A Bench

beginner·dumbbell

Plate Pinch position 1

Plate Pinch position 2

Plate Pinch

intermediate·other

Rickshaw Carry position 1

Rickshaw Carry position 2

Rickshaw Carry

intermediate·other

Seated Dumbbell Palms-Down Wrist Curl position 1

Seated Dumbbell Palms-Down Wrist Curl position 2

Seated Dumbbell Palms-Down Wrist Curl

beginner·dumbbell

Seated Dumbbell Palms-Up Wrist Curl position 1

Seated Dumbbell Palms-Up Wrist Curl position 2

Seated Dumbbell Palms-Up Wrist Curl

beginner·dumbbell

Seated One-Arm Dumbbell Palms-Down Wrist Curl position 1

Seated One-Arm Dumbbell Palms-Down Wrist Curl position 2

Seated One-Arm Dumbbell Palms-Down Wrist Curl

intermediate·dumbbell

Seated One-Arm Dumbbell Palms-Up Wrist Curl position 1

Seated One-Arm Dumbbell Palms-Up Wrist Curl position 2

Seated One-Arm Dumbbell Palms-Up Wrist Curl

beginner·dumbbell

Seated Palm-Up Barbell Wrist Curl position 1

Seated Palm-Up Barbell Wrist Curl position 2

Seated Palm-Up Barbell Wrist Curl

beginner·barbell

Seated Palms-Down Barbell Wrist Curl position 1

Seated Palms-Down Barbell Wrist Curl position 2

Seated Palms-Down Barbell Wrist Curl

beginner·barbell

Seated Two-Arm Palms-Up Low-Pulley Wrist Curl position 1

Seated Two-Arm Palms-Up Low-Pulley Wrist Curl position 2

Seated Two-Arm Palms-Up Low-Pulley Wrist Curl

beginner·cable

Also Works flexor digitorum profundus

10

Alternate Hammer Curl position 1

Alternate Hammer Curl position 2

Alternate Hammer Curl

beginner·dumbbell

Alternate Incline Dumbbell Curl position 1

Alternate Incline Dumbbell Curl position 2

Alternate Incline Dumbbell Curl

beginner·dumbbell

Alternating Hang Clean position 1

Alternating Hang Clean position 2

Alternating Hang Clean

intermediate·kettlebells

Atlas Stone Trainer position 1

Atlas Stone Trainer position 2

Atlas Stone Trainer

intermediate·other

Atlas Stones position 1

Atlas Stones position 2

Atlas Stones

Axle Deadlift position 1

Axle Deadlift position 2

Axle Deadlift

intermediate·other

Backward Drag position 1

Backward Drag position 2

Backward Drag

beginner·other

Band Assisted Pull-Up position 1

Band Assisted Pull-Up position 2

Band Assisted Pull-Up

beginner·other

Barbell Curl position 1

Barbell Curl position 2

Barbell Curl

beginner·barbell

Barbell Deadlift position 1

Barbell Deadlift position 2

Barbell Deadlift

intermediate·barbell

Related Forearm Muscles

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.

Tiny elbow extensor at back upper forearm, stabilizes during pressing and gripping. Aids triceps in extensions. Powerlifters note its elbow lockout role.

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.

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.

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.

extensor carpi ulnaris

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

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.

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 Pain Guide

Common causes and relief

Activities & Sports

See which activities use flexor digitorum profundus