MSK - Muscles of the Posterior Forearm Flashcards Preview

ESA 2 > MSK - Muscles of the Posterior Forearm > Flashcards

Flashcards in MSK - Muscles of the Posterior Forearm Deck (31):
1

Name the superficial muscles of the posterior forearm (7)

- Brachioradialis

- Extensor carpi radialis longus

- Extensor carpi radialis brevis

- Extensor digitorum

- Extensor digiti minimi

- Extensor carpi ulnaris

- Anconeus

2

What is the origin of brachioradialis?

Proximal aspect of the lateral supraepicondylar ridge of the humerus

3

Where does brachioradialis insert?

- Distal end of the radius

- Proximal to the radial styloid process

4

What is the innervation of brachioradialis?

Radial nerve (C5, C6)

5

What are the actions of brachioradialis?

- Flexion of the forearm at the elbow

(assists biceps brachii)

6

What is the blood supply of brachioradialis?

Radial recurrent artery

7

What is the origin of extensor carpi radialis longus?

Supracondylar ridge

8

Where does extensor carpi radialis longus insert?

Tendon attaches to metacarpal bone 2

9

What is the innervation of extensor carpi radialis longus?

Radial nerve (C6, C7)

10

What are the actions of extensor carpi radialis longus?

- Extension of the wrist

- Radial deviation of the hand at the wrist

11

What is the origin of extensor carpi radialis brevis?

Lateral epicondyle of the humerus

12

Where does extensor carpi radialis brevis insert?

Tendon attaches to metacarpal bone 3

13

What is the innervation of extensor carpi radialis brevis?

Radial nerve (C6, C7)

14

What are the actions of extensor carpi radialis brevis?

- Extension of the wrist

- Radial deviation of the hand at the wrist

15

What is the origin of extensor digitorum?

Lateral epicondyle of the humerus

16

Where does extensor digitorum insert?

- Tendon splits into four in the distal forearm

- Inserts into extensor hood of each finger

17

What is the innervation of extensor digitorum?

Deep branch of radial nerve (C6, C8)

18

What are the actions of extensor digitorum?

Extension of digits 2-4 at MCP and IP joints

19

What is the blood supply of extensor digitorum?

Posterior interosseous artery

20

What is the blood supply of extensor carpi radialis/brevis?

Radial artery

21

What is the origin of extensor digiti minimi?

Lateral epicondyle of the humerus

22

Where does extensor digiti minimi insert?

Base of 5th metacarpal

23

What is the innervation of extensor digiti minimi?

Radial nerve (C7, C8)

24

What are the actions of extensor digiti minimi?

- Extension of the wrist

- Ulnar deviation

25

What is the blood supply of extensor digiti minimi?

Posterior interosseous artery

26

What is the origin of anconeus?

Lateral epicondyle of the humerus

(Blends with triceps brachii so is often undistinguishable)

27

Where does anconeus insert?

Posterior and lateral part of the olecrannon

28

What is the innervation of anconeus?

Radial nerve (C7, C8)

29

What are the actions of anconeus?

- Moves ulna during pronation

- Extension of the forearm at the elbow joint

30

What is the blood supply of anconeus?

Middle collateral artery from the profunda brachii artery

31

How can the function of extensor digitorum be tested?

- Pronate the forearm

- Extend fingers against resistance

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