Module 3: Posterior Forearm, Hand, and Wrist Flashcards
What are the attachments of the brachioradialis?
origin: lateral supracondylar ridge of humerus
insert: distal radius, lateral to styloid process
What nerve innervates brachioradialis?
radial c5-6
What is the action of brachioradialis?
flex elbow
What are the attachments of extensor carpi radialis longus?
origin: lateral supracondylar ridge of humerus
insert: base of 2nd metacarpal
What nerve innervates extensor carpi radialis longus?
radial c6-8
What is the action of extensor carpi radialis longus?
extend wrist, radial deviation, flex elbow
What are the attachments of extensor carpi radialis brevis?
origin: lateral epicondyle of humerus
insert: base of 3rd metacarpal
What nerve innervates extensor carpi radialis brevis?
radial c6-8
What are the actions of extensor carpi radialis brevis?
extend wrist and radial deviation
What are the attachments of extensor digitorum?
origin: lateral epicondyle
insert: extensor expansion of digits 2-5
What nerve innervates extensor digitorum?
radial c6-8
What are the actions of extensor digitorum?
extend phalanges and wrist
What are the attachments of extensor digiti minimi?
origin: lateral epicondyle
insert: digital expansion of 5th digit
What nerve innervates extensor digiti minimi?
radial c7-8
What are the actions of extensor digiti minimi?
extend 5th digit
What are the attachments of extensor carpi ulnaris?
origin: lateral epicondyle
insert: base of 5th metacarpal
What nerve innervates extensor carpi ulnaris?
radial c6-8
What are the actions of extensor carpi ulnaris?
extend wrist and ulnar deviation
What are the superficial posterior forearm muscles?
- brachioradialis
- extensor carpi radialis longus
- extensor carpi radialis brevis
- extensor digitorum
- extensor digiti minimi
- extensor carpi ulnaris
What are the attachments of supinator?
origin: lateral epicondyle, radial collateral ligament, supinator crest of ulna
insert: lateral surface of proximal radius
What nerve innervates the supinator?
radial nerve c5-6
What is the action of the supinator?
supinates forearm
What are the attachments of extensor indicis?
origin: posterior surface of ulna + interosseous membrane
insert: digital expansion of 2nd digit
What nerve innervates extensor indicis?
radial c7-8