Wrist and Hand Muscles Flashcards
Abductor Pollicis Longus
O:posterior surface of ulna
I: radial side of the base of the 1st met
A: thumb and wrist abduction
Extensor Pollicis Longus
O: middle 3rd of posterior surface of ulna
I: base of distal phalanx of thumb
A: extension of distal phalanx of thumb
Extensor Pollicis Brevis
O: posterior surface of radius
I: base of prox phalanx of thumb
A: extension of prox phalanx of thumb
Abductor Pollicis Brevis
O: transverse carpal ligament, scaphoid, trapezium
I: base of the prox phalanx of thumb
A: thumb flexion
Opponens Pollicis
O: transverse carpal ligament, trapezium
I: lateral side of 1st met
A: thumb opposition
Adductor Pollicis Longus
O: oblique head: base of 2nd and 3rd met, capitate, and trapezoid. transverse head: anterior surface of 3rd met
I: ulnar side of the base of the prox phalanx of the 1st met
A: thumb adduction
Flexor Digit Minimi
O: transverse carpal ligament, hook of hamate
I: medial border of the 5th met
A: flexion of prox phalanx of 5th digit
Abductor Digit Minimi
O: pisiform bone, tendon of flexor carpi ulnaris
I: base of prox phalanx of 5th digit
A: abduction of 5th digit from the 4th
Opponens Digiti Minimi
O: transverse carpal ligament, hook of hamate
I: medial border of 5th met
A: opposition of 5th digit
Lumbricales
O: tendons of flexor digitorum profundus of fingers
I: lateral sides of tendons of extensor digitorum on proximal phalanges of each finger
A: flexion of each finger at MCP and extension at PIP and DIP
Dorsal Interossi
O: adjacent sides of mets
I: prox phalanx of each finger
A: abduction and flexion of 2-4 at MCP
Palmar Interossi
O: sides of mets (except middle one)
I: sides of bases of prox phalanges (except middle one)
A: adduction of fingers, flexion at MCP
