action of hand muscles

Question 1

lumbricals

Answer 1

flexion of the 2-5 fingers at the mcp and extension of the 2-5 at the ip

Question 2

palmar interossei

Answer 2

add of fingers toward 3rd, at mcp, assist flexion at mcp and extension at ip

Question 3

dorsal interossei

Answer 3

abd of 2-4 at mcp, flex digits at 2-4 at mcp and extend at ip

Question 4

adductor pollicis

Answer 4

adduct thumb cmc and mcp

Question 5

opponens digiti minimi

Answer 5

opposition of the 5th finger at the cmc

Question 6

flexor digiti minimi brevis

Answer 6

flexion of the the 5th finger at the mcp, assis in opposition of the 5th

Question 7

opponens pollici

Answer 7

opposition of thumb at cmc

Question 8

flexor pollicis brevis

Answer 8

flexion of the thumb at mcp and cmc, assists opposition

Question 9

abd pollicis brevis

Answer 9

abduction of the thumb at mcp and cmc

Question 10

extensor pollicis brevis

Answer 10

extension of the thumb at mcp and cmc

Question 11

extensor pollicis longus

Answer 11

extension of the ip thum, extend cmc and mcp at thumb, abd of wrist (weak)

Question 12

supinator

Answer 12

supination of the radio-ulnar joints

Question 13

extensor digiti minimi

Answer 13

extension of the little finger

Question 14

extensor indicis proprius

Answer 14

extension of the index finger, may assist wrist extension