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MSK Final > Posterior Forearm > Flashcards

Posterior Forearm Flashcards

1
Q

superficial group of posterior forearm compartment (6)

A 
brachioradialis 
extensor carpi radialis longus 
extensor carpi radialis brevis
extensor digitorum longus 
extensor digiti minimi 
extensor carpi ulnaris
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2
Q

deep group of posterior forearm compartment

A

supinator
abductor pollicis longus
extensor pollicis longus
extensor indicies

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3
Q

the superficial group and deep group of extensor muscles are separated by

A

the radial nerve

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4
Q

all muscles of the posterior forearm are innervated by the ______ nerve by either the _____ branch or _______ -______ nerve branch

A

radial nerve by the
deep branch or
posterior interosseous nerve branch

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5
Q

origin of brachioradialis m

A

supra-epicondylar ridge of humerus

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6
Q

insertion of brachioradilis m

A

lateral distal radius proximal styloid process

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7
Q

innervation of brachioradialis m

A

superficial branch of radial n

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8
Q

action of brachioradialis m

A

weak arm flexion

maximal when mid-pronated

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9
Q

brahcioradialis
extensor carpi radialis longus
extensor carpi radialis brevis
are all in what group of extensor muscles

A

the radialis group is all superficial

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10
Q

extensor carpi ulnaris
extensor digitorum
extensor digiti minimi
along with the radialis group make up the

A

superficial layer

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11
Q 
supinator
extensor pollicis longus 
abductor pollicis longus
extensor pollicis brevis 
extensor indicis 
are all in what layer of the posterior forearm
A

all are in the deep layer

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12
Q

superficial lateral group of posterior forearm consists of

A

extensor carpi radialis longus

extensor carpi radialis brevis

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13
Q

origin/insertion of extensor carpi radialis longus

A

lateral supraepicondylar ridge of humerus to dorsal side of 2nd metacarpal

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14
Q

action of extensor radialis longus

A

extend/abduct hand at wrist

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15
Q

innervation of extensor radialis longus

A

radial n

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16
Q

origin/insertion of extensor carpi radialis brevis

A

lateral epicondyle of humerus to dorsal base of 3rd metacarpal

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17
Q

action of extensor carpi radialis brevis

A

extend/abduct hand at wrist

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18
Q

origin/insertion of extensor carpi ulnaris

A

lateral epicondyle;posterior ulna via shared aponeurosis to dorsal base of 5th metatarsal

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19
Q

extensor carpi ulnaris innervation

A

posterior interosseous nerve

branch of deep branch of the radial nerve

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20
Q

extensor carpi ulnaris action

A

extend and adducts hand at wrist

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21
Q

origin/insertion of extensor digitorum

A

lateral epicondyle to extensor expansion of medial 4 digits

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22
Q

action of extensor digitorum

A

extends primarily at MPJ but also IPJ

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23
Q

innervation of extensor digitorum m

A

posterior interosseous n

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24
Q

origin/insertion of extensor digiti minimi

A

lateral epicondyle to extensor expansion of 5th digit

25
Q

action of extensor digiti minimi

A

extends 5th digit at MPJ but also IPJ

26
Q

innervation of extensor digiti minimi

A

posterior interosseous n

27
Q 
Supinator
extensor indices 
abductor pollicis longus 
extensor pollicis longus 
extensor pollicis brevis 
are part of the
A

deep group of extensor muscles

28
Q

origin/insertion supinator

A

deep part - ulna

superficial part - lateral condyle to radial tubercle; oblique line of radius

29
Q

action of supinator

A

supinates forearm

30
Q

innervation of supinator

A

deep branch of radial n

31
Q

origin/insertion of extensor indices

A

posterior surface distal ulna and IO membrane to extensor expansion of 2nd digit

32
Q

action of extensor indices

A

extend 2nd digit; assists extending hand at wrist

33
Q

innervation of extensor indices

A

posterior interosseous n

34
Q

origin/insertion of abductor pollicis longus

A

posterior half of ulna, radius IO to base of 1st metacarpal

35
Q

action of abductor pollicis longus

A

abduct thumb and extends at carpometacarpal joint

36
Q

innervation of abductor pollicis longus

A

posterior interosseous n

37
Q

origin/insertion extensor pollicis longus

A

posterior middle third ulna and IO to dorsal base of distal phalanx of thumb

38
Q

action of extensor pollicis longus

A

extend distal phalanx of thumb at PIJ; extends at MPJ and carpometacarpal joints

39
Q

innervation of extensor pollicis longus m

A

posterior interosseous n

40
Q

origin/insertion of extensor pollicis brevis

A

posterior distal radius and IO membrane to dorsal base of proximal phalanx of thumb

41
Q

action of extensor pollicis brevis

A

extend proximal phalanx of thumb at MPJ; extends carpometacarpal joints

42
Q

innervation of extensor pollicis brevis

A

posterior interosseous n

43
Q

extensor digitorum pulls on what structure causing the IP joint to extend

A

extensor expansion (a tendenous structure that extends from the proximal phalanx to the distal phalanx) connected to the extensor hood

44
Q

lumbricals are able to extend the IP joints by their insertion in what structure

A

the extensor hood

45
Q

describe the extensor expansion

A

tendonous structure that extends across the dorsal aspect of the phalanges that allows for extension of phalanges (even during flexion of MCP joint)

46
Q

the common interosseous artery gives rise to what two arteries of the forearm

A

the anterior interosseous a
(the perforating branch of the anterior interosseous)
posterior interosseous a

47
Q

what a supply the posterior forearm and hand

A 
common interosseous and its branches (A and P) 
perforating branch of anterior interosseous 
radial a (deep palmar, dorsal palmar arches)
48
Q

innervation to the posterior forearm is performed by what n

A

radial n and its branches
(superficial branch)
(deep branch –> posterior interosseous n)

49
Q

the deep branch of the radial n becomes the posterior interosseous after it crosses what muscle

A

becomes posterior interosseous as it begins passing through supinator

50
Q

radial n injuries subsequent to a proximal humerus injury may result in what lack of function

A

no elbow extension; weak supination

51
Q

radial n injuries subsequent to a a mid-humerus injury may result in what lack of function (in the radial groove)

A

muscle weakness depends on locaiton

52
Q

distal humerus injuries, such as repetitive forearm rotation, tennis elbow, compression, may result in what symptoms

A

wrist drop: inability to extend the hand, MCP joint and fully extend forearm

53
Q

trauma to the raidal n in the wrist may result in what symptoms

A

no sensory innervation to dorsal hand

54
Q

causes and symptoms of wrist drop

A

radial n injury in the distal humerus
paralysis of extensors of wrist and fingers results in inability to extend
flexors overrepresented

55
Q

lateral epicondylitis symptoms and primary muscles involved

A

overuse injury of extensors from lateral epicondyle
swelling, tenderness, pain in wrist extension
Ext. Carpi radialis brevis
ext. digitorum

56
Q

testing the radial n involves

A

testing resistance to extension by extensor digitorum

radial n only nerve to extend MCP joint

57
Q

contents of the anatomical snuffbox

A

superficial radial n

radial a

58
Q

borders of anatomical snuffbox

A 
Extensor pollicis brevis 
extensor pollicis longus 
abductor pollicis longus 
floor - scaphoid bone 
roof - superficial radial nerve branches
59
Q

DeQuervain’s disease

A

tenosynovitis of first compartment of thumb to Abductor pollicis longus, extensor pollicis brevis

+ Finkelsteins test

MSK Final (21 decks)

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