muscles of the posterior forearm deep layer and outcropping

Question 0

supinator insertion

Answer 0

lateral posterior and anterior surfaces of proximal third of radius

Question 1

supinator origin

Answer 1

lateral epicondyle of humerus
radial collateral and anular ligaments
supinator fossa
crest of ulna

Question 2

supinator innervation

Answer 2

deep branch of radial nerve

Question 3

supinator action

Answer 3

supinates forearm

Question 4

abductor pollicis longus origin

Answer 4

posterior surface of proximal halves of ulna, radius, and interosseous membrane

Question 5

abductor pollicis longus insertion

Answer 5

base of 1st metacarpal

Question 6

abductor pollicis longus innervation

Answer 6

posterior interosseous nerve

Question 7

abductor pollicis longus action

Answer 7

extends wrist joint

abducts thumb and extends it at carpometacarpal joint

Question 8

extensor pollicis longus origin

Answer 8

posterior surface of middle third of ulna and interosseous membrane

Question 9

extensor pollicis longus insertion

Answer 9

dorsal aspect of base of distal phalanx of thumb

Question 10

extensor pollicis longus innervation

Answer 10

posterior interosseous nerve

Question 11

extensor pollicis longus action

Answer 11

extends wrist joint
extends distal phalanx of thumb at interphalangeal joint
extends metacarpophalangeal joint and carpometacarpo joints

Question 12

extensor pollicis brevis origin

Answer 12

posterior surface of distal third of radius and interosseous membrane

Question 13

extensor pollicis brevis insertion

Answer 13

dorsal aspect of base of the proximal phalanx of the thumb

Question 14

extensor pollicis brevis innervation

Answer 14

posterior interosseous nerve

Question 15

extensor pollicis brevis action

Answer 15

extends wrist joint
extends proximal phalanx of thumb at metacarpophalangeal joint
extends carpometacarpal joint

Question 16

extensor indicis origin

Answer 16

posterior surface of distal third of ulna and interosseous membrane

Question 17

extensor indicis insertion

Answer 17

extensor expansion of 2nd finger

Question 18

extensor indicis innervation

Answer 18

posterior interosseous nerve

Question 19

extensor indicis action

Answer 19

extends wrist joint
extends 2nd finger (enabling independent extension)
helps extend hand at wrist