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MOINA of the forearm

Origin, Insertion, Nerve supply, Action of the muscles of the forearm

MuscleOriginInsertionNerveAction
Pronator teres Medial epicondyle of humerus, coronoid process of ulna Lateral surface of radius Median nerve (C6, C7) Pronates and flexes forearm.
Flexor carpi radialis Medial epicondyle of humerus Bases of 2nd and 3rd metacarpal bones Median nerve (C6, C7) Flexes and abducts hand at wrist joint
Palmaris longus Medial epicondyle of humerus Flexor retinaculum and palmar aponeurosis Median nerve (C7, C8) Flexes the hand
Flexor carpi ulnaris Medial epicondyle of humerus Pisiform bone, hook of hamate base at 5th metacarpal bone Ulnar nerve (C8; T1) Flexes and adducts the hand at wrist joint
Flexor digitorum superficialis Medial epicondyle of humerus medial border of coronoid process of ulna middle phalanx of medial 4 fingers Median nerve (C7, C8; T1) Flexes the middle phalanx of fingers, and assists in flexing the proximal phalanx and the hand.
Flexor pollicis longus anterior shaft of humerus Distal phalanx of the thumb anterior interosseous branch of median nerve (C8; T1) Flexes distal phalanx pf the thumb
Flexor digitorum profundus Anteromedial shaft of ulna Distal phalanges of medial 4 fingers Ulnar (medial half), and median (lateral half) nerves (C8; T1) Flexes distal phalanx of fingers, and assists in the flexion of middle and proximal phalanges
Pronator quadratus anterior shaft of ulna anterior shaft of radius anterior interosseous branch of median nerve (C8; T1) Pronates the forearm
Brachioradialis origin Lateral supracondylar ridge of humerus Base of styloid process of radius Radial nerve (C5, C6, C7) Flexes forearm at elbow joint,and rotates the forearm to midprone position.
Etensor carpi radialis longus Lateral supracondylar ridge of humerus Posterior base of 2nd metacarpal bone Radial nerve (C6, C7) Extends and abducts hand at wrist joint
Extensor carpi radialis brevis origin Lateral epicondyles of humerus Posterior base of 3rd metacarpal bone Deep branch of radial nerve (C7, C8) Extends and abducts the hand at wrist joint
Extensor digitorum Lateral epicondyle of humerus Middle and distal phalanges of medial 4 fingers Deep branch of radial nerve (C7, C8) Extends the fingers and the hand
Extensor digiti minimi Lateral epicondyle of humerus extensor expansion of little finger Deep branch of radial nerve (C7, C8) Extends metacarpal phalangeal joint of little finger
Extensor carpi ulnaris origin Lateral epicondyle of humerus Base of the 5th metacarpal bone Deep branch of radial nerve (C7, C8) Extends and adducts the hand at wrist joint
Anconeus Lateral epicondyle of humerus Lateral alecranon process of ulna Radial nerve (C7, C8; T1) Extends the elbow joint
Supinator Lateral epicondyle of humerus, anular ligament of proximal radioulnar joint and ulna Neck and shaft of the humerus Deep branch of radial nerve (C5, C6) Supination of the forearm
Abductor pollicis longus Posterior shaft of radius and ulna Base of the 1st metacarpal bone Deep branch of radial nerve (C7, C8) Abducts and extends the thumb
Extensor pollicis brevis Posterior shaft of radius Base of proximal phalanx of the thumb Deep branch of radial nerve (C7, C8) Extends the metacarpal phalangeal joints of the thumb
Extensor indicis Posterior shaft of ulna Extensor expansion of index finger Deep branch of radial nerve (C7, C8) Extends the metacarpophalangeal joint of the index finger
Extensor pollicis longus Posterior shaft of ulna Base of distal phalanx of the thumb Deep branch of radial nerve (C7, C8) Extends the distal phalanx of the thumb.
Created by: alssndr
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