Forearm and Hand

Extensor Carpi Radialis Longus and Brevis - Origin

common extensor origin - lateral epicondyle of the humerus

Extensor Carpi Radialis Longus and Brevis - Insertion

base of 2nd metacarpal (ECRL)

base of 3rd metacarpal (ECRB)

Extensor Carpi Radialis Longus and Brevis - action

wrist extension and radial deviation

Extensor Carpi Radialis Longus and Brevis - innervation

radial

extensor digitorum - origin

common extensor origin - lateral epicondyle of the humerus

extensor digitorum - insertion

by 4 tendons, each to the base of the extensor mechanism and to the dorsal base of the proximal phalanx of the fingers

extensor digitorum - action

extends the MCP joints, extends the IP joints of the second through 5th digits

extensor digitorum - innervation

radial nerve

extensor digiti minimi - origin

ulnar side of the belly of the extensor digitorum

extensor digiti minimi - insertion

tendon usually divides joining the ulnar side of the tendon of the extensor digitorum

extensor digiti minimi - action

extends the MCP joints, extends the IP joints of the little finger

extensor digiti minimi - innervation

radial

extensor carpi ulnaris - origin

common extensor origin - lateral epicondyle of the humerus

extensor carpi ulnaris - insertion

base of 5th metacarpal

extensor carpi ulnaris - action

extension of wrist and ulnar deviation

extensor carpi ulnaris - innervation

radial

abductor pollicis longus - origin

pposterior surface of the middle part of the radius and ulna, and adjacent interossesous membrane

abductor pollicis longus - insertion

base of 1st metacarpal

abductor pollicis longus - action

1st digit ABD and extension at CMC joint

abductor pollicis longus - innervation

radial

extensor pollicis brevis - origin

posterior surface of the middle to distal parts of the radius and adjacent interosseous membrane

extensor pollicis brevis - insertion

proximal phalanx of thumb

extensor pollicis brevis - action

1st digit extension at MCP, CMC joints

extensor pollicis brevis - innervation

radial nerve

extensor pollicis longus - origin

posterior surface of middle part of the ulna and adjacent interosseous mebrane

extensor pollicis longus - insertion

distal phalanx of thumb

extensor pollicis longus - action

1st digit extension at MCP, IP joints

extensor pollicis longus - innervation

radial

extensor indicis - origin

posterior surface of the middle to distal part of the ulna and adjacent interosseous membrane

extensor indicis - insertion

tendon blends with the ulnar side of the index tendon of the extensor digitorum

extensor indicis - action

2nd digit extension and wrist extension

extensor indicis - innervation

radial