Posterior Forearm Flashcards

1
Q

What nerve innervates the brachioradialis?

A

radial nerve

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2
Q

What is the only posterior compartment forearm muscle that flexes the forearm?

A

Brachioradialis

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3
Q

How many muscles lay in the posterior forearm and in how many layers?

A

12 muscles

2 layers

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4
Q

What are the generalised functions of the posterior forearm compartment?

A

Extension and supination

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5
Q

All muscles in the posterior forearm are innervated by …

A

The radial nerve

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6
Q

Name the superficial muscles of the posterior forearm

A
Brachioradialis 
Extensor carpi radialis longus
Extensor carpi radialis brevis 
Extensor digitorum
Extensor carpi ulnaris 
Anconeus
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7
Q

Name the deep muscles of the posterior forearm

A
Supinator
Abductor pollicis longus 
Extensor pollicis longus
Extensor indicis 
Extensor digiti minimi
Extensor pollicis brevis
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8
Q

What forms the medial border of the anatomical snuffbox?

A

Tendon of extensor pollicis longus

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9
Q

What forms the lateral border of the anatomical snuffbox?

A

Tendon of abductor pollicis longus

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10
Q

What passes through the anatomical snuffbox?

A

radial artery

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11
Q

What is the origin of brachioradialis?

A

Lateral supra epicondylar ridge of humerus

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12
Q

What is the insertion of brachioradialis?

A

Distal radius

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13
Q

What is the action of brachioradialis?

A

Flex elbow

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14
Q

What is the origin of ECRL?

A

Lateral supracondylar ridge of humerus

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15
Q

What is the origin of ECRB?

A

Lateral epicondyle of humerus

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16
Q

What is the attachment for both ECR muscles?

A

Metacarpals II and III

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17
Q

What are the actions of the ECR muscles?

A

Extend and abduct wrist

18
Q

What is the origin of extensor digitorum?

A

Lateral epicondyle humerus

19
Q

What is the insertion of extensor digitorum?

A

Extensor hood of each finger

20
Q

What is the action of extensor digitorum?

A

Extends medial 4 digits at MCP and IP joints

21
Q

What is the origin of extensor digiti minimi?

A

Lateral epicondyle humerus

22
Q

What is the insertion of extensor digiti minimi?

A

Extensor hood of little finger

23
Q

What is the action of EDM?

A

Extends little finger and contributes to extension of wrist

24
Q

What is the origin of ECU?

A

Lateral epicondyle humerus

25
What is the insertion of ECU?
Base of metacarpal V
26
What is the action of ECU?
Extends and adducts wrist
27
What is the origin of anconeus?
Lateral epicondyle humerus
28
What is the insertion of anconeus?
Olecranon
29
What is the action of anconeus?
Move ulna during pronation | Extend elbow
30
What is the medical term for Tennis elbow?
Lateral epicondylitis
31
What is the insertion of supinator?
Radius
32
What is the origin of APL?
Posterior radius and ulna
33
What is the insertion of APL?
Lateral side of base of metacarpal I
34
What is the origin of EPB?
Posterior radius
35
What is the insertion of EPB?
Base of proximal phalanx of thumb
36
What is the action of EPB?
Extends at MCP and CMC joints of thumb
37
What is the origin of EPL?
Posterior ulna
38
What is the insertion of EPL?
Distal phalanx of thumb
39
What is the action of EPL?
Extends all joints of thumb
40
What is the origin of EIP?
Posterior ulna
41
What is the insertion of EIP?
Extensor hood of index finger