Extensors of wrist and hand Flashcards
superficial extensor group
Extensor carpi radialis longus
extensor carpi ulnaris
Extensor carpi radialis brevis
extensor digitorum communis
Extensor digiti minimi
deep extensor group
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis
extensor carpi radialis
O- lateral supraepicondylar Ridge of humerus
I- base of second metacarpal
N- radial nerve (C6, C7)
A- extends and radially deviates hand
Extensor carpi ulnaris
O- lateral epicondyle
I- base of fifth metacarpal
N- posterior interrosseous (C7, C8)
A- extends and ulnar deviates wrist
extensor carpi radialis brevis
O- lateral epicondyle
I- base of third metacarpal
N- deep radial nerve (C7, C8)
A- extends, and radially deviates hand
extensor digitorum communis
O- lateral epicondyle
I- extensor expansions
N- posterior interrosseous
A- extends digits 2-5
extensor digiti minimi
O-ulnar side extensor digitorum
I- extensor expansion of digit five
N- posterior interosseous nerve (C7, C8)
A- extends 5th digit
Abductor pollicis longus
O- posterior surface, middle owner, radius, and interosseous membrane
I- base of first metacarpal
N- posterior interosseous nerve (C7, C8)
A- abducts thumb and extends at CMC joint
extensor pollicis brevis
O- middle 1/3 posterior surface of radius and interosseous membrane
I- base of proximal phalanx of thumb
N- posterior interosseous nerve (C7, C8)
A- extends proximal phalanx of thumb and extends CMC joint
Extensor pollicis longus
O- middle 1/3 posterior surface of ulna and interosseous membrane
I- face of distal phalanx of thumb
N- posterior interosseous nerve (C7, C8)
A- extends thumb
Extensor indicis
O- posterior surface of ulna and interosseous membrane
I- extensor digitorum, tending to finger
N- posterior interosseous nerve
A- extends index finger
True or false
There are no intrinsic muscles on the dorsum of the hand
True
