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T1 ANATOMY > Muscles of the Posterior Forearm > Flashcards

Muscles of the Posterior Forearm Flashcards

1
Q

Muscles of the posterior forearm are considered the __________________ group.

A

Extensor-Supinator

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2
Q

What are the 2 layers of the muscles of the posterior forearm?

A

1) Superficial Layer
2) Deep Layer

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3
Q

A less clinically relevant structure that the extensor tendons at the wrist pass under.

A

Extensor Retinaculum

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4
Q

What are the 6 muscles in the superficial layer of the posterior forearm?

A

1) Brachioradialis
2) Extensor Carpi Radialis Longus (ECRL)
3) Extensor Carpi Radialis Brevis (ECRB)
4) Extensor Digitorum (ED)
5) Extensor Digiti Minimi
6) Extensor Carpi Ulnaris (ECU)

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5
Q

Proximal Attachment: lateral supracondylar ridge of humerus (proximal part)
Distal Attachment: lateral, distal radius

A

Brachioradialis

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6
Q

What is the action of brachioradialis?

A

Elbow Flexion

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7
Q

Brachioradialis is the strongest elbow flexor when the forearm is in a _______ position.

A

Neutral

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8
Q

Brachioradialis is part of the __________________ group because it is innervated by the ______ nerve, which is the same as the other muscles in that group.

A

Extensor-Supinator
Radial

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9
Q

Proximal Attachment: lateral supracondylar ridge of humerus (distal part)
Distal Attachment: base of 2nd MC

A

Extensor Carpi Radialis Longus (ECRL)

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10
Q

What are the 2 actions of extensor carpi radialis longus?

A

1) Wrist Extension
2) Radial Deviation (with FCR/ECRB)

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11
Q

A common proximal tendinous attachment that connects to the lateral epicondyle of the humerus.

A

Common Extensor Tendon (CET)

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12
Q

Associated with inflammation of the common extensor tendon and also referred to as lateral epicondylitis.

A

Tennis Elbow

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13
Q

Proximal Attachment: lateral epicondyle of humerus via CET
Distal Attachment: base of 3rd MC

A

Extensor Carpi Radialis Brevis (ECRB)

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14
Q

What are the 2 actions of extensor carpi radialis brevis?

A

1) Wrist Extension
2) Radial Deviation (with FCR/ECRL)

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15
Q

Which 3 muscles make up the WAD of 3?

A

1) Brachioradialis
2) Extensor Carpi Radialis Longus (ECRL)
3) Extensor Carpi Radialis Brevis (ECRB)

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16
Q

Proximal Attachment: lateral epicondyle of humerus via CET
Distal Attachment: distal phalanges of medial 4 digits

A

Extensor Digitorum (ED)

17
Q

What are the 2 actions of extensor digitorum?

A

1) 2nd-5th Digit Extension (MCP & IP joints)
2) Wrist Extension

18
Q

Proximal Attachment: lateral epicondyle of humerus via CET
Distal Attachment: extensor expansion of 5th digit MCP

A

Extensor Digiti Minimi

19
Q

What is the action of extensor digiti minimi?

A

5th Digit Extension

20
Q

Connective tissue that forms a hood at the 2nd-5th MCPs to support local structures.

A

Extensor Expansion

21
Q

Proximal Attachment: lateral epicondyle of humerus via CET
Distal Attachment: base of 5th MC

A

Extensor Carpi Ulnaris (ECU)

22
Q

What are the 2 actions of extensor carpi ulnaris?

A

1) Wrist Extension
2) Ulnar Deviation (with FCU)

23
Q

What are the 5 muscles of the deep layer of the posterior forearm?

A

1) Supinator
2) Extensor Incidis
3) Abductor Pollicis Longus
4) Extensor Pollicis Brevis
5) Extensor Pollicis Longus

24
Q

Proximal Attachment: lateral epicondyle of humerus, LCL and annular ligament (superficial layer) and supinator fossa/crest of ulna (deep layer)
Distal Attachment: anterior, lateral and posterior parts of proximal radius

A

Supinator

25
Q

What is the action of supinator?

A

Forearm Supination

26
Q

Proximal Attachment: posterior mid-distal ulnar surface and interosseous membrane
Distal Attachment: extensor expansion of 2nd digit at MCP

A

Extensor Incidis

27
Q

What is the action of extensor incidis?

A

2nd Digit Extension

28
Q

Proximal Attachment: posterior mid-distal surface of ulna, radius and interosseous membrane
Distal Attachment: base of 1st MC

A

Abductor Pollicis Longus

29
Q

What is the action of abductor pollicis longus?

A

1st Digit Abduction (CMC joint)

30
Q

Proximal Attachment: posterior mid-distal radial surface and interosseous membrane
Distal Attachment: base of proximal phalanx of thumb

A

Extensor Pollicis Brevis

31
Q

What is the action of extensor pollicis brevis?

A

1st Digit Extension (CMC & MCP joints)

32
Q

Proximal Attachment: posterior mid-distal ulnar surface and interosseous membrane (superior to extensor incidis)
Distal Attachment: base of distal phalanx of thumb

A

Extensor Pollicis Longus

33
Q

What is the action of extensor pollicis longus?

A

1st Digit Extension (MCP & IP joints)

34
Q

Extensor pollicis longus uses ________ tubercle as a pulley.

A

Lister’s

35
Q

A hollow on the posterior lateral aspect of the hand at the base of the thumb. The radial artery passes through this area.

A

Anatomical Snuffbox

36
Q

What is the anterior border of the anatomical snuffbox?

A

Abductor Pollicis Longus
Extensor Pollicis Brevis

37
Q

What is the posterior border of the anatomical snuffbox?

A

Extensor Pollicis Longus

38
Q

What carpal bone makes up the floor of the anatomical snuffbox?

A

Scaphoid

T1 ANATOMY (31 decks)

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