Intrinsic Muscles of the Hand - Thenar Compartent

Question 1

flexor pollicis brevis

Answer 1

origin: lateral carpal bones and flexor retinaculum
insertion: base of the proximal phalanx of digit 1
innervation: recurrent motor branch of the median n.
action: flexion of the thumb

Question 2

abductor pollicis brevis

Answer 2

origin: lateral carpal bones and flexor retinaculum
insertion: base of the proximal phalanx of digit 1
innervation: recurrent motor branch of the median n.
action: abduction of the thumb

Question 3

opponens pollicis

Answer 3

origin: lateral carpal bones and flexor retinaculum
insertion: metacarpal 1
innervation: recurrent motor branch of the median n.
action: opposition of the thumb