Deep posterior forearm

Question 1

Innervation of deep posterior forearm

Answer 1

Radial nerve

Question 2

Origins of supinator

Answer 2

Lateral epicondyle

Posterior surface of ulna

Question 3

Attachment of supinator

Answer 3

Posterior surface of radius

Question 4

Action of supinator

Answer 4

Supination of forearm

Question 5

Origin of abductor pollicis longus

Answer 5

Interosseous membrane,

adjacent surfaces of radius and ulna

Question 6

Attachment of abductor pollicis longus

Answer 6

Lateral side of base of metacarpal 1

Question 7

Action of abductor pollicis longus

Answer 7

Abduction of thumb

Question 8

Origin of extensor pollicis longus

Answer 8

Posterior surface of ulna

Interosseous membrane

Question 9

Attachment of extensor pollicis longus

Answer 9

Distal phalanx of thumb

Question 10

Action of extensor pollicis longus

Answer 10

Extension of all thumb joints

Question 11

Origin of extensor indicis

Answer 11

Posterior surface of ulna

Interosseous membrane

Question 12

Attachment of extensor indicis

Answer 12

Extensor hood of index finger

Question 13

Action of extensor indicis

Answer 13

Extends all index finger joints

Question 14

Origin of extensor digiti minimi

Answer 14

Lateral epicondyle

Question 15

Attachment of extensor digiti minimi

Answer 15

Extensor hood of little finger

Question 16

Action of extensor digiti minimi

Answer 16

Extends little finger

Contributes to wrist extension

Question 17

Origin of extensor pollicis brevis

Answer 17

Posterior surface of radius

Interosseous membrane

Question 18

Attachment of extensor pollicis brevis

Answer 18

Base of proximal phalanx of thumb

Question 19

Action of extensor pollicis brevis

Answer 19

Extends at CMC and MCP of thumb

Question 20

Muscles of deep posterior forearm

Answer 20

Supinator, 
Abductor pollicis longus,
Extensor pollicis longus,
Extensor indicis, 
Extensor digiti minimi,
Extensor pollicis brevis