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Anatomy > Muscles of the posterior forearm > Flashcards

Muscles of the posterior forearm Flashcards

1
Q

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

A

Extension

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2
Q

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

A

Two; superficial and deep

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3
Q

What nerve innervates all the muscles in the posterior forearm?

A

The radial nerve

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4
Q

How many muscles are in the superficial layer?

A

7

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5
Q

Which muscles are in the superficial layer?

A 
Brachioradialis
Aconeus
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extensor digiti minimi
Extensor digitorum
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6
Q

What is the main action of the Brachioradialis?

A

Flexion at the elbow!*

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7
Q

What does the Brachioradialis cover?

A

Radial artery

Radial nerve

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8
Q

What innervates the Brachioradialis?

A

Radial nerve

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9
Q

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

A

Deep

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10
Q

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

A

Extension at the wrist

Abduction at the wrist

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11
Q

What innervates the Extensor carpi radialis longus/brevis?

A

The radial nerve

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12
Q

What is the main action of the Extensor digitorum?

A

Extends the fingers at the metacarpophalangeal joint and interphalangeal joint

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13
Q

What innervates the Extensor digitorum?

A

The radial nerve

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14
Q

What is the main action of the Extensor digiti minimi?

A

Extends the little finger

Contributes to extension at the wrist

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15
Q

What innervates the Extensor digiti minimi?

A

The radial nerve

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16
Q

Where is the Extensor carpi ulnaris?

A

On the medial side of the posterior forearm

17
Q

What are the main actions of the Extensor carpi ulnaris?

A

Extension at the wrist

Adduction at the wrist

18
Q

What nerve innervates the Extensor carpi ulnaris?

A

The radial nerve

19
Q

Where is the Aconeus muscle?

A

Most medial in the forearm

Its fibres blend with the tendon of the Triceps brachii

20
Q

What is the main action of the Aconeus muscle?

A

Moves the Ulna during pronation

Extends at the elbow joint

21
Q

What innervates the Aconeus muscle?

A

The radial nerve

22
Q

What is wrist drop a sign of?

A

Radial nerve damage

23
Q

What is wrist drop?

A

Unopposed flexion as all the extensor muscles are paralysed

24
Q

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

A

5

25
Q

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

A 
Supinator
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis
26
Q

What is special about the Supinator muscle?

A

Has 2 heads with the radial nerve running between the 2

27
Q

What innervates the Supinator muscle?

A

The radial nerve

28
Q

What is the main action of the Supinator muscle?

A

Supination of the forearm

29
Q

Where is the Abductor pollicis longus?

A

Distal to the Supinator

Lateral side of the forearm

30
Q

What is the main action of the Abductor pollicis longus?

A

Abducts the thumb

31
Q

What innervates the Abductor pollicis longus?

A

Radial nerve

32
Q

Where is the Extensor pollicis brevis?

A

Medial and deep to Abductor pollicis longus

33
Q

What is the main action of the Extensor pollicis brevis?

A

Extends the Metacarpophalangeal joint of the thumb

Extends the CarpoMetacarpel joint of the thumb

34
Q

What innervates the Extensor pollicis brevis?

A

The radial nerve

35
Q

What is the main action of the Extensor pollicis longus?

A

Extends all joints of the thumb

36
Q

What innervates the Extensor pollicis longus?

A

The radial nerve

37
Q

What does the Extensor indicis allow?

A

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

38
Q

What innervates Extensor indicis?

A

The radial nerve

39
Q

What is the main action of Extensor indicis?

A

Extension of the index finger

Anatomy (45 decks)

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