posterior superficial forearm muscles Flashcards
innervation of posterior compartment plus brachioradialis
radial N
extensor carpi radialis longus origin and insertion
o - lateral supracondylar ridge
i - base of 2nd metacarpal
extensor carpi radialis brevis origin and insertion
o - lateral epicondyle
i - base of 3rd metacarpal
extensor carpi radialis longus and brevis action
extend radiocarpal joint
assist radial deviation (abduction) radiocarpal joint
extensor digitorum origin and insertion
o - lateral epicondyle
i - extensor expansion (distal and middle phalanges)
extensor digitorum action
extend MCP, PIP, DIP digits 2-5
extend radiocarpal joint
extensor digiti minimi origin and insertion
o - lateral epicondyle
i - 5th phalanx extensor expansion ( medial to extensor digitorum)
extensor digiti minimi action
extend 5th MCP
weak extension of radiocarpal joint
extensor carpi ulnaris origin and insertion
o - lateral epicondyle and posterior ulna
i - base of 5th metacarpal
extensor carpi ulnaris action
extend radiocarpal joint
assist ulnar deviation (adductio) radiocarpal joint
brachioradialis (not part of any compartment) origin and insertion and innervation
o - lateral supracondylar ridge
i - lateral distal radial styloid process
in - radial N
brachioradialis action
flex humeroulnar joint in neutral position (thumb to ceiling)
