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MED221A/B Lectures > MSK 11 - Forearm and extensor aspect > Flashcards

MSK 11 - Forearm and extensor aspect Flashcards

1
Q

how many superficial extensor muscles are there in the forearm

A

7

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2
Q

what are the 7 superficial extensor muscles in the forearm

A

brachioradialis
anconeus
extensor carpi radialis longus
extensor carpi radialis brevis
extensor carpi ulnaris
extensor digiti minimi
extensor digitorum

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3
Q

what is the one muscle of the extensor superficial muscles of the forearm that is on the anterior forearm instead of being on the posterior side of the forearm

A

brachioradialis

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4
Q

what is the origin and insertion of brachioradialis

A

origin = supracondylar ridge

insertion = base of radial styloid process

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5
Q

what is the role and action of brachioradialis

A

the one muscle in extensor compartment that flexes the forearm

shunt muscle for elbow

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6
Q

what structure runs medially down the medial side of the brachioradialis

A

radial artery and nerve

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7
Q

what is the origin and insertion of anconeus

A

origin = supracondylar ridge

insertion = neck of ulna

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8
Q

what is the origin and insertion of extensor carpi radialis longus

A

origin = supracondylar ridge

insertion = base of 2nd metacarpal

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9
Q

what is the origin and insertion of extensor carpi radialis brevis

A

origin = common extensor tendon

insertion = base of 3rd metacarpal

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10
Q

what is the origin and insertion of extensor carpi ulnaris

A

origin = common extensor tendon

insertion = base of 5th metacarpal

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11
Q

what is the origin and insertion of extensor digiti minimi

A

origin = common extensor tendon

insertion = base of 5 proximal phalanges

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12
Q

what is the origin and insertion of extensor digitorum

A

origin = common extensor tendon

insertion = dorsal digital expansion hood

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13
Q

what connects the extensor digitorum tendons at the metacarpal level

A

intertendinous bands

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14
Q

what is the action of anconeus

A

extension of elbow

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15
Q

what are the two tendons that make up the anatomical snuff box borders

A

extensor pollicis longus (medially) and extensor pollicis brevis (laterally)

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16
Q

what do the carpi muscles do what is its role

A

stabilize the wrist

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17
Q

what is the clinical sign of radial nerve damage

what movement does this affect and why does this occur

A

wrist drop

radial nerve damage affects flexor efficiency

when using powerful grip wrist is slightly extended so flexor muscles are at appropriate length and gives strength - this is lacking in radial nerve damage

18
Q

what is the movement generated when the FCU and FCR are fired together

A

only flexion

19
Q

what is the movement generated when the FCU and ECU are fired together

A

adduction only

20
Q

what is the movement generated when the ECU and ECRL/ECRB are fired together

A

extension only

21
Q

what is the movement generated when the ECRL/ECRB and FCR are fired together

A

only abduction

22
Q

what is the movement generated when only the FCU is fired

A

flexion and adduction

23
Q

what is the movement generated when only the FCR is fired

A

flexion and abduction

24
Q

what is the movement generated when only the ECU is fired

A

adduction and extension

25
Q

what is the movement generated when only the ECRB and ECRL are fired

A

abduction and extension

26
Q

how many deep extensor muscles are there in the forearm

A

6 - technically 5

27
Q

what are the 6 deep extensor muscles in the forearm

A

supinator deep head
supinator superficial head
extensor pollicis longus
extensor pollicis brevis
abductor pollicis longus
extensor indicis

28
Q

what is the origin and insertion of extensor pollicis longus

A

origin = back of radius and interosseous membrane

insertion = base of distal phalanx of thumb

29
Q

what is the origin and insertion of extensor indicis

A

origin = back of radius and interosseous membrane

insertion = dorsal digital expansion hood

30
Q

what is the origin and insertion of abductor pollicis longus

A

origin = back of radius and interosseous membrane

insertion = base of 1st metacarpal

31
Q

what is the origin and insertion of extensor pollicis brevis

A

origin = back of the interosseous membrane

insertion = base of proximal phalanx of thumb

32
Q

does the extensor indicis interact with the other extensor digitorum tendons at all

what does this mean in terms of movement

A

doesnt interact at all

can extend index finger with the 3rd and 4th flexed but cant do this the other way around

33
Q

what is the origin and insertion of supinator (deep head)

A

origin = proximal radius

insertion = lateral epicondyle

34
Q

what is the origin and insertion of supinator (superficial head)

A

origin = proximal radius

insertion = crest beside radial notch

35
Q

what structure runs between the supinator muscle - describe its path

A

radial nerve

runs down the posterior humerus and lateral of elbow between brachioradialis and brachialis then the deep radial nerve branch dives between the heads of the supinator muscle

36
Q

describe the path of the radial nerve in terms of its branching

A

radial nerve splits into deep and superficial branches at the supinator muscle below the lateral epicondyle

the deep branch goes on to become the posterior interosseous nerve

the superficial branch continues down the forearm to the wrist

37
Q

what muscles are innervated by the radial nerve itself - 4 muscles

A

triceps
anconeus
brachioradialis
extensor carpi radialis longus

38
Q

what muscles are innervated by the deep branch of the radial nerve - 2 muscles

A

extensor carpi radialis brevis
supinator

39
Q

what muscles are innervated by the posterior interosseous nerve - 7 muscles

A

extensor digitorum
extensor digiti minimi
extensor carpi ulnaris
abductor pollicis longus
extensor pollicis longus
extensor indicis
extensor pollicis brevis

40
Q

where does the radial nerve deep branch become the posterior interosseous nerve

A

between supinator muscle

41
Q

what does the superficial branch of the radial nerve innervate

A

back of hand - just cutaneous

MED221A/B Lectures (23 decks)

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