intricate muscles of the hand: thenar muscles of thumb Flashcards
1
Q
Abductor pollicis brevis
A
O: flexor retinaculum and nearby carpals
I: lateral base of thumb’s proximal phalanx
N: median nerve. roots c8, t1
K: abducts thumb at carpometacarpal joint
2
Q
Flexor pollicis brevis
A
O: flexor retinaculum and nearby carpals
I: lateral side of base of thumb’s proximal phalanx
N: median nerve. roots c8, t1
K: flexes thumb at carpometacarpal and metacarpophalengeal joints
3
Q
Opponens pollicis
A
O: flexor retinaculum and trapezium
I: whole anterior side of metacarpal 1
N: median nerve
K: opposition
4
Q
Adductor pollicis
A
O: capitate bone and bases of metacarpals 2-4, front of metacarpal 3
I: medial side of base of proximal phalanx of thumb
N: ulnar nerve. roots: c8, t1
K: adducts and helps to oppose thumb
