forearm muscles origin, insertion, and innervation

flexor digitorum profundus

Origin: anteriomedial ulna and interosseous membrane. Insertion: Distal phalanges of fingers Innervation: Ulnar nerve

flexor pollicis longus

Origin: anterior radius and interosseous membrane. Insertion: palmar base of distal phalanx of the thumb Innervation: Anterior interosseous nerve

pronator teres

Origin: humeral head: medial epicondyle and supraepicondylar ridge Insertion: ulnar head: coronoid process. lateral midshaft radius Innervation: Median nerve Action: Pronator of forearm, flexion of the elbow

flexor carpi ulnaris

Origin: humeral head: medial epicondyle and supraepicondylar ridge ulnar head: olecranon. Insertion: Pisiform then to hamate and base of MC 5 via pisohamate and pisometacarpal ligaments Innervation: Ulnar nerve

flexor digitorum superficialis

Origin: humero-ulnar head: medial epicondyle and coronoid process radial head: oblique line of radius. Insertion: palmar surface of middle phalanges of 4 fingers Innervation: Median nerve

extensor carpi radialis brevis

Origin: lateral epicondyle and IM septum. Insertion: Dorsal base of MC2 and 3 Innervation: Deep branch of radial nerve

extensor digiti minimi

Origin: lateral epicondyle and IM septum. Insertion: Extensor hood of little finger Innervation: Posterior interosseus nerve

extensor digitorum

Origin: lateral epicondyle and IM septum. Insertion: Extensor hoods of middle and distal phalanges Innervation: Posterior interosseus nerve

supinator

Origin: lateral epicondyle, radial collateral and annular ligaments, supinator crest of ulna Insertion: Surface of the proximal third of the radial shaft Innervation: Deep branch of the radial nerve

anconeous

Origin: lateral epicondyle. Insertion: olecranon and proximal posterior surface of ulna Innervation: Radial nerve

extensor carpi radialis longus

Origin: lateral supraepicondylar ridge and IM septum. Insertion: Dorsal base of MC2 Innervation: Radial nerve

brachioradialis

Origin: lateral supraepicondylar ridge and IM septum. Insertion: Distal radius Innervation: Radial nerve

palmaris longus

Origin: medial epicondyle Insertion: palmar aponeurosis Innervation: Median nerve Action: Flexion of the hand at the wrist joint

flexor carpi radialis

Origin: medial epicondyle, base of Insertion: Metacarpal 1 and 2 Innervation: Median nerve

extensor pollicis brevis

Origin: posterior radius and interosseous membrane. Insertion: dorsal base of proximal phalanx of thumb Innervation: Posterior interosseous nerve

extensor pollicis longus

Origin: posterior ulna and interosseous membrane. Insertion: dorsal base of distal phalax of thumb Innervation: Posterior interosseous nerve

extensor indicis

Origin: posterior ulna and interosseous membrane. Insertion: extensor hood of index finger Innervation: Posterior interosseous nerve Action: Extension of the 2nd digit

abductor pollicis longus

Origin: posterior ulna and radius and interosseous membrane. Insertion: base of MC1 Innervation: Posterior interosseous nerve

extensor carpi ulnaris

Origins: lateral epicondyle and posterior border of ulna. Insertion: Medial side of the base of MC 5 Innervation: Posterior interosseus nerve