Thumb & Hand Flashcards
Abductor pollicis longus
O: posterior surface of radius and ulna, Interosseous membrane
I: base of first metacarpal (Duim)
F: abduct the thumb
extend the thumb
abduct the wrist
extensor pollicis longus
O: posterior surface of ulna and interosseous membrane
I: base of distal phalanx of thumb
F: extend the thumb, abduct the wrist
extensor pollicis brevis
O: posterior surface of radius and interosseous membrane
I: base of proximal pahlanx of thumb
F: extend the thumb,
abduct the wrist
abductor pollicis brevis
O: flexor retinaculum, trapezium and scaphoid tubercles
I: base of proximal phalanx of thumb
F: abduct the thumb, assist in opposition
flexor pollicis brevis
O: superfical head: flexor retinaculum
deep head: trapezium, trapezoid, capitate
I: base of proximal phalanx of thumb
F: flex the thumb, assist in opposition
opponens pollicis
O: flexor retinaculum, tubercle of the trapezium
I: entire length of first metacarpal bone,
adductor pollicis
O: capitate, second and third metacarpals
I: base of promal phalanx of thumb
F: adduct the thumb
Lumbricals
O: surfaces of the flexor digitorum profundus tendons 2-5
I: extensor aponeurosis on dorsal surface of phalanges 2-5
F: extend/flex the fingers
Palmar interossei
O: base of 1-2 and 4-5 metacarpals
I: base of the proximal phalanx and the extensor aponeurosis of the related finger
F: adduct, assist to flex/extend
dorsal interossei
O: adjacent sides of all matacarpals
I: base of the proximal phalanx and the extensor aponeurosis of 2-4th fingers
F: abduct the 2-4 fingers at the metacarpophangeal joints
abductor digiti minimi
O: pisiform and tendon of flexor carpi ulnaris
I: base of proximal phalanx of fifth finger, ulnar surface
F: abduct the fifth finger, assist in opposition
flexor digiti minimi brevis
O: hook of hamate and flexor retinaculum
I: base of proximal phalanx of fifth finger, palmar surface
F: flex the fifth finger
opponens digiti minimi
O: hook of hamate and flexor retinaculum
I: shaft of fifth metacarpal, ulnar surface
F: opposition of fifth metacarpal
