Forearm Superficial Extensors Flashcards
Which muscles are superficial forearm extensors?
Brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi and extensor carpi ulnaris
What are the attachment sites for brachioradialis?
O: lateral humeral supracondylar ridge
I: lateral aspect of the distal radius
What is the action for brachioradialis?
Flex forearm (most force when forearm is mid pronated)
Which muscles are innervated by the radial N?
Brachioradialis and extensor carpi radialis longus
What are the attachment sites of extensor carpi radialis longus?
O: lateral humeral supracondylar ridge
I: dorsal aspect of the base of the 2nd metacarpal
What is the action of extensor carpi radialis longus?
Extend and abduct the hand at the wrist
Which muscles are active during fist clenching?
Extensor carpi radialis longus and extensor carpi ulnaris
What are the attachment sites for extensor carpi radialis brevis?
O: lateral humeral epicondyle
I: dorsal aspect of the base of 3rd metacarpal
What is the action of extensor carpi radialis brevis?
Extend and abduct hand at the wrist
What innervates extensor carpi radialis brevis?
Deep radial N
Which muscles are innervated by posterior interosseous N?
Extensor digitorum, extensor digiti minimi and extensor carpi ulnaris
What are the attachment sites for extensor digitorum?
O: lateral humeral epicondyle
I: extensor expansions of digits 2-5
What is the action of extensor digitorum?
Extend hand at the wrist
Extend all phalanges of digits 2-5 at the MP, PIP and DIP joints
What are the attachment sites for extensor digiti minimi?
O: lateral humeral epicondyle
I: extensor expansion of digit 5
What is the action of extensor digiti minimi?
Extend all phalanges of digit 5 at the MP, PIP and DIP joints
