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Musculoskeletal > Posterior Forearm Muscles (Quiz 2/Exam 2) > Flashcards

Posterior Forearm Muscles (Quiz 2/Exam 2) Flashcards

1
Q

The extensor muscles are on the __________________________ compartment of the forearm

A

posterior (extensor-supinator)

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2
Q

The extensor muscles are on the posterior (extensor-supinator) compartment of the forearm. They are all innervated by branches of the….

A

radial n.

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3
Q

The extensor muscles are on the posterior (extensor-supinator) compartment of the forearm. What are the 3 functional groups?

A

1) muscles that extend and abduct or adduct the hand at the wrist joint
2) muscles that extend the medial 4 fingers
3) muscles that extend or abduct the thumb

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4
Q

What are the 3 muscles that extend and abduct or adduct the hand at the wrist joint?

A

1) extensor carpi radialis longus
2) extensor carpi radialis brevis
3) extensor carpi ulnaris

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5
Q

What are the 3 muscles that extend the medial 4 fingers?

A

1) extensor digitorum
2) extensor indicis
3) extensor digiti minimi

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6
Q

What are the 3 muscles that extend or abduct the thumb?

A

1) abductor pollicis longus
2) extensor pollicis brevis
3) extensor pollicis longus

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7
Q

What are the 6 superficial extensors?

A

1) extensor carpi radialis brevis
2) extensor digitorum
3) extensor digit minimi
4) extensor carpi ulnaris
5) brachioradialis
6) extensor carpi radialis longus

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8
Q

4 of the superficial extensors
1) extensor carpi radialis brevis
2) extensor digitorum
3) extensor digit minimi
4) extensor carpi ulnaris
are all attached proximally by a common extensor tendon to the __________ epicondyle

A

lateral

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9
Q

The proximal attachment of the brachioradialis and extensor carpi radialis longus is to the lateral ________________ ridge of the humerus and adjacent lateral inter-muscular system

A

supraepicondylar

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10
Q

What is the origin/proximal attachment of the brachioradialis?

A

proximal 2/3 of supra-epicondylar ridge of humerus

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11
Q

What is the insertion/distal attachment of the brachioradialis?

A

lateral surface of distal end of radius proximal to styloid process

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12
Q

What innervates the brachioradialis?

A

radial n.

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13
Q

What are the actions of the brachioradialis?

A

relatively weak flexion of forearm (maximal when forearm is mid-pronated, aka thumb facing ceiling/perpendicular to ceiling)

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14
Q

The _________________ and the ______________ are the only muscles of the posterior forearm compartment that do not cross and therefore are incapable of acting at the wrist

A

brachioradialis, supinator

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15
Q

What is the origin/proximal attachment for the extensor carpi radialis longus (ECRAL)?

A

lateral supra-epicondylar ridge of humerus

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16
Q

What is the insertion/distal attachment of the extensor carpi radialis longus (ECRAL)?

A

dorsal aspect of base of 2nd metacarpal

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17
Q

What innervates the extensor carpi radialis longus (ECRAL)?

A

deep branch of the radial n.

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18
Q

What are the actions of the extensor carpi radialis longus (ECRAL)?

A

-extend and abduct the arm at wrist joint
-extensor carpi radialis longus (ECRAL) is active during fist clenching

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19
Q

What is the origin/proximal attachment of the extensor carpi radialis brevis (ECRB)?

A

lateral epicondyle of the humerus (common extensor origin)

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20
Q

What is the insertion/distal attachment of the extensor carpi radialis brevis (ECRB)?

A

dorsal aspect of base of the 3rd metacarpal

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21
Q

What innervates the extensor carpi radialis brevis (ECRB)?

A

deep branch of the radial n.

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22
Q

What are the actions of the extensor carpi radialis brevis (ECRB)?

A

-extend and abduct the hand at the wrist joint
-extensor carpi radialis brevis (ECRB) is active during fist clenching

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23
Q

What is the origin/proximal attachment for the extensor digitorum?

A

lateral epicondyle of humerus (common extensor origin)

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24
Q

What is the insertion/distal attachment of the extensor digitorum?

A

extensor expansions of medial 4 digits (sides of fingers)

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25
Q

What innervates the extensor digitorum?

A

deep branch of the radial n.

26
Q

What are the actions of the extensor digitorum?

A

extends medial 4 digits primarily at the metacarpophalangeal (MCP) joints, secondarily as interphalangeal (IP) joints

27
Q

What is the origin/proximal attachment of the extensor digiti minimi?

A

lateral epicondyle of the humerus (common extensor origin)

28
Q

What is the insertion/distal attachment of the extensor digiti minimi?

A

extensor expansion of 5th digit

29
Q

What innervates the extensor digiti minimi?

A

deep branch of radial n.

30
Q

What are the actions of the extensor digit minimi?

A

extends 5th digit primarily at MCP joint and secondarily at IP joint

31
Q

What are the origins/proximal attachments for the extensor carpi ulnaris (ECU)?

A

-lateral epicondyle of humerus
-posterior border of ulna via a shared aponeurosis

32
Q

What is the insertion/distal attachment for the extensor carpi ulnaris (ECU)?

A

dorsal aspect of the base of the 5th metacarpal

33
Q

What innervates the extensor carpi ulnaris (ECU)?

A

deep branch of radial n.

34
Q

What are the actions of the extensor carpi ulnaris (ECU)?

A

-extends and adducts the hand at wrist joint
-active during fist clenching

35
Q

Which muscles are active during fist clenching?

A

-extensor carpi radialis longus
-extensor carpi radialis brevis
-extensor carpi ulnaris

36
Q

What muscles have distal attachments to the metacarpals?

TEST Q

A

1st metacarpal) abductor pollicis longus
2nd) extensor carpi radialis longus
3rd) extensor carpi radialis brevis
4th) nothing
5th) extensor carpi ulnaris

37
Q

What muscles have attachments to digit expansions?

TEST Q

A

1st expansion) extensor digitorum (medial 4 digit expansions)
2nd) extensor indicis
3rd) nothing
4th) nothing
5th) extensor digit minini

38
Q

What are the origins/proximal attachments of the supinator?

A

-lateral epicondyle of the humerus
-radial collateral and anular ligaments
-supinator fossa
-crest of ulna

39
Q

What are the insertions/distal attachments for the supinator?

A

lateral, posterior, and anterior surfaces of the proximal 3rd of radius

40
Q

What innervates the supinator?

A

deep branch of radial n.

41
Q

What are the actions of the supinator?

A

-supinates forearm
-rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

42
Q

What is the origin/proximal attachment for the extensor indicis?

A

posterior surface of distal 3rd of ulna and interosseous membrane

43
Q

What is the insertion/distal attachment of the extensor indicis?

A

extensor expansion of 2nd digit

44
Q

What innervates the extensor indicis?

A

deep branch of radial n.

45
Q

What are the actions of the extensor indicis?

A

-extends 2nd digit (enabling its independent extension)
-helps extend hand at the wrist

46
Q

What is the origin/proximal attachment of the abductor pollicis longus?

A

posterior surface of the proximal halves of the ulna, radius, and interosseous membrane

47
Q

What is the insertion/distal attachment of the abductor pollicis longus?

A

base of 1st metacarpal

48
Q

What innervates the abductor pollicis longus?

A

deep branch of the radial n.

49
Q

What is the action of the abductor pollicis longus?

A

abducts thumb and extends it at the CMC joint

50
Q

What is the origin/proximal attachment of the extensor pollicis longus?

A

posterior surface of the middle 3rd of ulna and interosseous membrane

longuuuuus =uuuuulna

51
Q

What is the insertion/distal attachment of the extensor pollicis longus?

A

dorsal aspect of the base of the distal phalanx of the thumb

52
Q

What innervates the extensor pollicis longus?

A

deep branch of the radial n.

53
Q

What are the actions of the extensor pollicis longus?

A

-extends distal phalanx of thumb at IP joint
-extends MCP and CMC joints

54
Q

What is the origin/proximal attachment for the extensor pollicis brevis?

A

posterior surface of the distal 3rd of the radius and interosseous membrane

rrrrrrrrrrrrrrradius = brrrrrrrrevis

55
Q

What is the insertion/distal attachment of the extensor pollicus brevis?

A

dorsal aspect of the base of the proximal phalanx of the thumb

56
Q

What innervates the extensor pollicis brevis?

A

deep branch of the radial n.

57
Q

What are the actions of the extensor pollicis brevis?

A

-extends proximal phalanx at thumb at the MCP joint
-extends CMC joint

58
Q

When can you see the anatomical snuff box?

A

when thumb is abducted

59
Q

What is the medial boundary of the anatomical snuffbox?

test q

A

extensor pollicis brevis

60
Q

What is the lateral boundary of the anatomical snuffbox?

test q

A

extensor pollicis longus and abductor pollicis longus

61
Q

What is the floor of the anatomical snuffbox?

A

scaphoid and trapezium

62
Q

What artery is within the anatomical snuffbox?

A

radial a.

Musculoskeletal (17 decks)

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