Forearm & Wrist: Posterior Deep

Question 1

supinator (origin)

Answer 1

posterolateral surface of ulna below radial notch
lateral epicondyle
radial and annular ligaments

Question 2

supinator (insertion)

Answer 2

lateral and adjacent posterior and anterior aspects of proximal shaft of radius

Question 3

supinator (action)

Answer 3

supination of forearm (and hand)

Question 4

supinator (nerve)

Answer 4

radial nerve

Question 5

supinator (blood)

Answer 5

radial recurrent and posterior interosseous arteries

Question 6

abductor pollicis longus (origin)

Answer 6

posterior surface of ulna and radius
interosseous membrane

Question 7

abductor pollicis longus (insertion)

Answer 7

base of 1st metacarpal

Question 8

abductor pollicis longus (action)

Answer 8

ABDuction and extension of thumb
radial deviation (abduction)
flexion of hand at wrist

Question 9

abductor pollicis longus (nerve)

Answer 9

radial nerve

Question 10

abductor pollicis longus (blood)

Answer 10

posterior interosseous artery

Question 11

extensor pollicis longus (origin)

Answer 11

posterior surface of middle 3rd of ulna
interosseous membrane

Question 12

extensor pollicis longus (insertion)

Answer 12

distal phalanx of thumb

Question 13

extensor pollicis longus (action)

Answer 13

extension of proximal and distal phalanges of thumb
extension and ADDuction of metacarpal of thumb

Question 14

extensor pollicis longus (nerve)

Answer 14

radial nerve

Question 15

extensor pollicis longus (blood)

Answer 15

posterior interosseous artery

Question 16

extensor pollicis brevis (origin)

Answer 16

posterior surface of the radius
interosseous membrane

Question 17

extensor pollicis brevis (insertion)

Answer 17

proximal phalanx of the thumb

Question 18

extensor pollicis brevis (action)

Answer 18

extension of proximal phalanx and metacarpal of thumb
ABDuction of hand at wrist

Question 19

extensor pollicis brevis (nerve)

Answer 19

radial nerve

Question 20

extensor pollicis brevis (blood)

Answer 20

posterior interosseous artery

Question 21

extensor indicis (origin)

Answer 21

posterior surface of ulna
interosseous membrane

Question 22

extensor indicis (insertion)

Answer 22

extensor expansion of index finger

Question 23

extensor indicis (action)

Answer 23

extension and ADDuction of index finger

Question 24

extensor indicis (nerve)

Answer 24

radial nerve

Question 25

extensor indicis (blood)

Answer 25

posterior interosseous artery