MSK - Posterior Forearm Muscles (Deep) Flashcards Preview

ESA 2 > MSK - Posterior Forearm Muscles (Deep) > Flashcards

Flashcards in MSK - Posterior Forearm Muscles (Deep) Deck (18):
1

What are the FIVE deep muscles of the posterior forearm?

- Supinator

- Abductor Pollicis Longus

- Extensor Pollicis Brevis

- Extensor Pollicis Longus

- Extensor Pollicis Proprius

2

What is the origin of the supinator?

- One head from lateral epicondyle

- One head from posterior surface of the ulna

3

Where does the supinator insert?

Posterior surface of the radius

4

What are the actions of the supinator?

- Supination of the forearm

5

What is the blood supply of the supinator?

Radial recurrent artery

6

What is the origin of abductor pollicis longus?

- Interosseous membrane

- Adjacent posterior surfaces of the radius and ulna

7

Where does abductor pollicis longus insert?

Lateral side of the base of metacarpal 1

8

What are the actions of abductor pollicis longus?

Abduction of the thumb

9

What is the blood supply of abductor pollicis longus?

Posterior interosseous artery

10

What is the origin of extensor pollicis brevis?

- Posterior surface of the radius

- Interosseous membrane

11

Where does extensor pollicis brevis insert?

Base of the proximal phalanx of the thumb

12

What are the actions of extensor pollicis brevis?

- Extension of MCP joint of the thumb

- Extension of the carpometacarpal joint of the thumb

13

What is the blood supply of extensor pollicis brevis?

Posterior interosseous artery

14

What is the origin of extensor indicis proprius?

- Posterior surface of the ulna

- Interosseous membrane

(distal to extensor pollicis longus)

15

Where does extensor indicis proprius insert?

Extensor hood of the index finger

16

What are the actions of extensor indicis proprius?

Extension of the index finger

17

What is the blood supply of extensor indicis proprius?

Posterior interosseous artery

18

Which nerve innervates all of the posterior forearm muscles?

Radial Nerve

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