Muscles of the posterior forearm Flashcards Preview

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Flashcards in Muscles of the posterior forearm Deck (39):
1

What is the main action of the muscles in the posterior forearm?

Extension

2

How many layers of muscles are there in the posterior forearm?

Two; superficial and deep

3

What nerve innervates all the muscles in the posterior forearm?

The radial nerve

4

How many muscles are in the superficial layer?

7

5

Which muscles are in the superficial layer?

Brachioradialis
Aconeus
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extensor digiti minimi
Extensor digitorum

6

What is the main action of the Brachioradialis?

Flexion at the elbow!*

7

What does the Brachioradialis cover?

Radial artery
Radial nerve

8

What innervates the Brachioradialis?

Radial nerve

9

What is the postition of the Extensor carpi radialis brevis to the Extensor carpi radialis longus?

Deep

10

What is the main action of the Extensor carpi radialis longus/brevis?

Extension at the wrist
Abduction at the wrist

11

What innervates the Extensor carpi radialis longus/brevis?

The radial nerve

12

What is the main action of the Extensor digitorum?

Extends the fingers at the metacarpophalangeal joint and interphalangeal joint

13

What innervates the Extensor digitorum?

The radial nerve

14

What is the main action of the Extensor digiti minimi?

Extends the little finger
Contributes to extension at the wrist

15

What innervates the Extensor digiti minimi?

The radial nerve

16

Where is the Extensor carpi ulnaris?

On the medial side of the posterior forearm

17

What are the main actions of the Extensor carpi ulnaris?

Extension at the wrist
Adduction at the wrist

18

What nerve innervates the Extensor carpi ulnaris?

The radial nerve

19

Where is the Aconeus muscle?

Most medial in the forearm
Its fibres blend with the tendon of the Triceps brachii

20

What is the main action of the Aconeus muscle?

Moves the Ulna during pronation
Extends at the elbow joint

21

What innervates the Aconeus muscle?

The radial nerve

22

What is wrist drop a sign of?

Radial nerve damage

23

What is wrist drop?

Unopposed flexion as all the extensor muscles are paralysed

24

How many muscles are in the deep compartment of the posterior forearm?

5

25

What are the muscles in the deep compartment of the posterior forearm?

Supinator
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis

26

What is special about the Supinator muscle?

Has 2 heads with the radial nerve running between the 2

27

What innervates the Supinator muscle?

The radial nerve

28

What is the main action of the Supinator muscle?

Supination of the forearm

29

Where is the Abductor pollicis longus?

Distal to the Supinator
Lateral side of the forearm

30

What is the main action of the Abductor pollicis longus?

Abducts the thumb

31

What innervates the Abductor pollicis longus?

Radial nerve

32

Where is the Extensor pollicis brevis?

Medial and deep to Abductor pollicis longus

33

What is the main action of the Extensor pollicis brevis?

Extends the Metacarpophalangeal joint of the thumb
Extends the CarpoMetacarpel joint of the thumb

34

What innervates the Extensor pollicis brevis?

The radial nerve

35

What is the main action of the Extensor pollicis longus?

Extends all joints of the thumb

36

What innervates the Extensor pollicis longus?

The radial nerve

37

What does the Extensor indicis allow?

The index finger to be independent of the other fingers during extension

38

What innervates Extensor indicis?

The radial nerve

39

What is the main action of Extensor indicis?

Extension of the index finger