Deep layer: Extensor muscles of the Posterior Compartment

Question 0

Insertion of supinator

Answer 0

Lateral, posterior, and anterior surface of proximal 3rd of radius.

Question 1

Origin of supinator

Answer 1

Lateral epicondyle of humerus
Radial collateral and anular ligaments
Supinator fossa
Crest of ulna

Question 2

Innervation of Supinator

Answer 2

Deep branch of radial nerve C7 C8

Question 3

Action of Suppinator

Answer 3

Supinates forearm

rotates radius to turn palm anterior or posterioly if elbow is flexed

Question 4

Origin of Abductor pollicis longus

Answer 4

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

Question 5

Insertison of abductor pollicis longus

Answer 5

base of 1st metacarpal

Question 6

Innervation of Abductor pollicis longus

Answer 6

Posterior interosseous membrane C7 C8

Question 7

Action of Abductor pollicis longus

Answer 7

Extends wrist joint
abducts thumb
extend thumb at carpometacarpal joint

Question 8

Origin of Extensor pollicis longus

Answer 8

Posterior surface of middle third of ulna and interosseous membrane

Question 9

Insertion of Extensor pollicis longus

Answer 9

Dorsal aspect of base of distal phalanx of thumb

Question 10

Innervation of extensor pollicis longus

Answer 10

Posterior interosseous membrane C7 C8

Question 11

Action of Extensor pollicis longus

Answer 11

Extend wrist joint
Extends distal phalanx of thumb at interphalangeal joint
Extends metacarpophalangeal and carpometacarpal joints

Question 12

Origin of extensor pollicis brevis

Answer 12

Posterior surface of distal third of radius and interosseous membrane

Question 13

Insertion of Extensor pollicis brevis

Answer 13

Dorsal aspect of base of proximal phalanx of thumb

Question 14

Innervation of Extensor pollicis brevis

Answer 14

Posterior interosseous membrane C7 C8

Question 15

Action of Extensor pollicis brevis

Answer 15

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

Question 16

Origin of Extensor indicis

Answer 16

Posterior surface of distal third of ulna and interosseous membrane

Question 17

Insertion of extensor indicis

Answer 17

Extensor expansion of 2nd finger

Question 18

Innervation of Extensor indicis

Answer 18

Posterior inerosseous nerve C7 C8

Question 19

Action of Extensor indicis

Answer 19

Extends wrist joint
extends 2nd finger enabling is independent extension
extend hand at wrist