oinas forearm - posterior compartment (extensors & supinators)

* remember most of these: o - lateral epicondyle, n - radial

extensor caripi radialis brevis

o - dorsal side,

i - base of 3rd metacarpal

n - radial

a - wrist extension, radial deviation

extensor carpi ulnaris

o - lateral epicondyle, posterior border of the ulna

i - dorsal side, base of the 5th metacarpal

n - ulnar

a - wrist extension, ulnar deviation

adbuctor pollicis longus

o - posterior surface of ulna, radius, and interosseus membrane

i - base of 1st metacarpal

n - radial

a - carpometacarpal extension, abduction

extensor indicis

o - posterior surface of the distal 1/3 of ulna, interosseous membrane

i - extensor expansion of 2nd digit

n - radial

a - distal IP, proximal IP, metacarpophalangeal extension of digit 2, wrist extension

coracobrachialis

o - tip of coracoid process

i - middle medial 3rd of humerus

n - musculocutaneous

a - shoulder flexion, adduction

extensor carpi radialis longus

o - lateral supra-epicondylar ridge of humerus

i - dorsal side, base of 2nd metacarpal

n - radial

a - wrist extension, radial deviation

extensor digitorum

o - lateral epicondyle

i - extensor expansion of digits 2 - 5

n - radial

a - metacarpophalangeal, proximal IP, distal IP extension via extensor expansion

supinator

o - lateral epicondyle, RCL, annular ligament, supinator fossa, crest of ulna

i - lateral, anterior, and posterior surface of proximal ulna

n - radial

a - supination

extensor pollicis longus

o - posterior surface of middle 1/3 of ulna

i - dorsal side, base of distal phalanx digit 1

n - radial

a - carpometacarpal, metacarpophalangeal, interphalangeal extension of digit 1