10.13 Muscles of Posterior Forearm

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Fig 10.16 of text

Extensor pollicis longus

A, O: Middle posterior ulna and interosseous membrane
I: Base of distal phalanx of thumb, dorsal surface
F: Extension of IP and MP joints of thumb
Extension (and adduction) of the saddle joint of thumb
N: Radial nerve, posterior interosseous nerve (C6 - C8)

Extensor pollicis brevis

B, O= posterior radius and interosseous membrane. I= base of proximal phalanx of thumb. F= extends thumb CMP and MCP joints

Abductor pollicis longus

C, O: Posterior radius, interosseous membrane and middle ulna
I: Base of 1st metacarpal
F: Abduction (and extension) of saddle joint of thumb
(Radial deviation and flexion of wrist joint)
N: Radial nerve (C6 - C7)

Extensor digitorum

D, O=lateral epicondyle/ I=2-5 distal & middle phalanges/ A=extends distal & middle phalanges of each finger/ N=Radial

Extensor carpi radialis brevis

E, O: Common extensor tendon from lateral epicondyle of humerus
I: Base of 3rd metacarpal
F: Extension (with radial devi
ation) of wrist joint
N: Radial nerve (C6 - C7)

Extensor carpi radialis longus

F, O: Supracondylar ridge of humerus
I: Base of 2nd metacarpal
F: Radial deviation with extension of wrist joint
N: Radial nerve (C6 - C7)

Extensor indicis

G, O: Distal ulna
I: Base of distal phalanx of index finger
F: Extension of MP, PIP, and DIP joints of index finger
N: Radial nerve (C6 - C8)

Extensor digiti minimi

H, O: Common extensor tendon from lateral epicondyle of humerus
I: Base of distal phalanx of 4th finger
F: Extension of MP, PIP, and DIP joints of 4th finger
N: Radial nerve, deep branch (C6 - C8)

Extensor carpi ulnaris

I, O: Common extensor tendon from the lateral epircondyle of humerus
I: Base of 5th metacarpal
A: Extend the writst (radiocarpal jt)
Adduct the wrist (radiocarpal jt)
N: Radial

Flexor carpi ulnaris

J, O= humeral head: medial epicondyle of humerus; ulnar head: olecranon and posterior ulna. I= pisiform, hook of hamate and base of 5th metacarpal. F= wrist flexion and ulnar deviation

Anconeus

K, origin= lateral epicondyle of humerous, insertion= lateral olecranon & proximal posterior ulna, function= stabilizes humerolulna joint & assist tricep w/elbow flexion, innervation= radial nerve (C7-8)

Supinator

L, O: Lateral epicondyle of humerus and adjacent ulna
I: Anterior surface of proximal radius
F: Supination of forearm
N: Radial nerve (C6)

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