Posterior Forearm - Deep layer

Question 1

Extensor pollicis brevis origin

Answer 1

posterior surface of distal third radius and interosseous membrane

Question 2

extensor pollicis brevis action

Answer 2

• extension of hand

- extension of carpometacarpal and metacarpophalangeal joint

Question 3

extensor pollicis brevis insertion

Answer 3

base of proximal phalanx of thumb

Question 4

extensor pollicis brevis nerve and blood supply

Answer 4

Posterior interosseous

Question 5

extensor pollicis longus origin

Answer 5

posterior surface of middle third of ulna and interosseous membrane

Question 6

extensor pollicis longus insertion

Answer 6

base of distal phalanx of thumb

Question 7

extensor pollicis longus nerve and blood supply

Answer 7

posterior interosseous

Question 8

extensor pollicis longus action

Answer 8

• extension at wrist
• extension of distal phalanx at interphalangeal joint
• extension at carpometacarpal and metacarpophalangeal joints of digit 1

Question 9

extensor indicis insertion

Answer 9

extensor expansion of digit 2

Question 10

extensor indicis nerve and blood supply

Answer 10

posterior interosseous

Question 11

extensor indicis origin

Answer 11

posterior surface of distal third of ulna and interosseous membrane

Question 12

extensor indicis action

Answer 12

• extension of hand

- extension of digit 2

Question 13

abductor pollicis longus origin

Answer 13

• posterior surface of proximal halves of ulna
• radius
• interosseous membrane

Question 14

abductor pollicis longus insertion

Answer 14

base of 1st metacarpal

Question 15

abductor pollicis longus nerve and bs

Answer 15

posterior interosseous

Question 16

abductor pollicis longus action

Answer 16

• extension at wrist
• abduction of digit 1
• extension at carpometacarpal joint

Question 17

supinator action

Answer 17

supination of forearm

Question 18

supinator origin

Answer 18

• lateral epicondyle
• radial collateral and annular ligaments
• supinator fossa
• crest of ulna

Question 19

supinator insertion

Answer 19

lateral, posterior, and anterior surfaces of proximal third of radius

Question 20

supinator nerve and bs

Answer 20

deep branch of radial nerve

radial recurrent artery