Muscles Of Anterior Forearm and Hand

Question 1

which muscles radially deviate the wrist?

Answer 1

flexor caprpi radialis

extensor carpi radialis

Question 2

which superficial muscles flex the wrist?

Answer 2

flexor carpi radialis

flexor carpi ulnaris

Question 3

what are the 3 groups of hand muscles? what do they do?

Answer 3

thenar= thumb movement
mesothenar= movement middle 3 fingers
hypothenar= movement little finger

Question 4

list the hypothenar muscles and state whether they are deep or superficial

Answer 4

flexor digiti minimi= superficial
abductor digiti minimi= superficial
opponens digiti minimi= deep

Question 5

list the thenar muscles and state whether they are deep or superficial

Answer 5

flexor pollicis brevis= superficial
abductor pollicis brevis= superficial
adductor pollicis= deep
opponens pollicis= deep

Question 6

what are lumbricals?

Answer 6

muscles between superficial and deep flexor tendons which flex mcp joint but extend ip joints

Question 7

what are interosseous muscles?

Answer 7

muscles between metacarpels which abduct or adduct at mcp joint:
palmar interossei adduct
dorsal interossei abduct

Question 8

what are the two extrinsic flexors of the fingers?

Answer 8

flexor digitorum superficialis

flexor digitorum profundus

Question 9

what is the retinacula?

Answer 9

tough fibrous tissue preventing long tendons that cross the wrist from bowstringing- important when carrying heavy loads

Question 10

which muscles are involved in a power grip?

Answer 10

flexor digitorum profundus= flexion distal ip joint

extorsor carpi ulnaris & extensor carpi radialis longus/brevis= extend wrist

Question 11

which muscles are involved in a precision grip?

Answer 11

flexor digitorum superficialis/profundus= flex proximal ip joint
lumbricals, interossei & thenar muscles= control fine hand movements