Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MSAK-1 > Muscles of the Posterior (Extensor-Supinator) Compartment of the Forearm > Flashcards

Muscles of the Posterior (Extensor-Supinator) Compartment of the Forearm Flashcards

1
Q

The most superficial muscles of the posterior compartment of the forearm arise from where?

A

lateral epicondyle of the humerus via common extensor tendon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The deep muscles of the posterior compartment of the forearm mainly arise from where

A

posterior ulna, radius, and interosseous membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Are all muscles in the posterior compartment of the forearm innervated by the same nerve? Which nerve(s)?

A

all innervated by radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What holds the extensor tendons in place?

A

extensor retinaculum

prevents bowstrigning of tendons when hand is hyperextended @ wrist joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is synovial sheath

A

encompasses tendons that pass over dorsum of wrist to reduce friction between extensor tendons and bones`

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What muscles are included in the wad of three?

A

Brachioradialis, Extensor carpi radialis longus, extensor carpi radialis brevis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is considered the ‘beer drinking muscle’?

A

brachioradialis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the origin of the brachioradialis

A

proximal 2/3 of lateral supracondylar ridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the insertion of the brachioradialis

A

superior to styloid process of radius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What muscle of the posterior compartment passes anterior to the axis of flexion/extension
?

A

brachioradialis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What nerve innervates the brachioradialis

A

radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the origin of the extensor carpi radialis longus

A

distal 1/2 of lateral supracondylar ridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the insertion of the extensor carpi radialis longus

A

base of 2nd metacarpal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the functions of the extensor carpi radialis longus

A

ext of hand @ wrist joint

abduction of hand @ wrist joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the innervation of the extensor carpi radialis longus

A

radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the origin of the extensor carpi radialis brevis

A

lateral epicondyle vis common extensor tendon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the insertion of the extensor carpi radialis brevis

A

base of 3rd metacarpal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are the functions of the extensor carpi radialis brevis

A

ext of hand @ wrist joint

abduction of hand @ wrist joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What nerve innervates the extensor carpi radialis brevis

A

radial nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the origin of the extensor digitorum

A

lateral epicondyle via common extensor tendon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the insertion of the extensor digitorum

A

distal and middle phalanges of digits 2-5 via dorsal digital expansion

22
Q

What are the functions of the extensor digitorum

A

ext of digits 2-5 @ MCP, PIP, DIP
weak ex of forearm @ elbow joint
ex of hand @ wrist joint

23
Q

What nerve innervates the extensor digitorum

A

radial nerve

24
Q

What is the origin of the extensor digit minimi

A

lateral epicondyle via common extensor tendon

25
Q

What is the insertion of the extensor digiti minimi

A

middle and distal phalanges of pinkie via its dorsal digital expansion

26
Q

What are the functions of the extensor digiti minimi

A

ext of pinkie @ MCP, PIP, DIP
ext of hand @ wrist joint
weak ext of forearm @ elbow joint

27
Q

What nerve innervates the extensor digiti minimi

A

radial nerve

28
Q

What is the dorsal digital expansion also known as

A

extensor hoods

29
Q

What is a dorsal digital expansion

A

triangular tendinous aponeurosis that wraps the metacarpalphalageal joints and extent along proximal and middle phalanges across two interphalangeal joints to attach to the distal phalanx on the dorsal aspect of digits 2-5

30
Q

what muscles attach to the sides of the dorsal digital expansion

A

interossei and lumbrical muscles

31
Q

What causes the ‘Ta-Ta’ movement. What is the ‘Ta-Ta’ movement

A

muscles come from the palm to the sides of the digits and insert to the corners of the base of the dorsal digital expansion

does flex of MCP and passive ext of PIP+DIP

32
Q

What is the origin of the extensor carpi ulnaris

A

lateral epicondyle via common extensor tendon

middle posterior border of ulna

33
Q

What is the insertion of the extensor carpi ulnaris

A

base of 5th metacarpal

34
Q

What are the functions of the extensor carpi ulnaris

A 
ext of hand @ wrist joint
ulnar deviation (ADD) of hand @ wrist joint
ext of forearm @ elbow joint
35
Q

What nerve innervates the extensor carpi ulnaris

A

radial nerve

36
Q

What is the origin of the anconeus?

A

lateral epicondyle of humerus

*note NOT via common extensor tendon

37
Q

What is the insertion of the anconeus

A

lateral side of olecranon

proximal 1/4 of posterior surface of shaft of ulna

38
Q

What are the functions of the anconeus

A

extension of forearm @ elbow joint

39
Q

What nerve innervates anconeus

A

radial nerve

40
Q

What is the origin of the supinator

A

supinator crest of ulna, lateral epicondyle of humerus

41
Q

What is the insertion of the supinator

A

proximal lateral surface of radius

42
Q

What is the innervation of supinator

A

radial nerve

43
Q

What is medial epicondylitis also known as

A

golf elbow

44
Q

What causes medial epicondylitis

A

forceful and repeated flexion/pronation of wrist and digits causes ruptures of common flexor tendon, small tears in muscle begin to heal but when re-injured becomes painful

45
Q

What are the symptoms of medial epicondylitis

A

tenderness/pain @ med. epicondyle

made worse by flexing wrist

46
Q

What is lateral epicondylitis also known as

A

tennis elbow

47
Q

What causes lateral epicondylitis

A

repeated extension and supination of common extensor tendon

usually result of specific strain, overuse and direct impact

(sometimes no cause)

48
Q

What are the symptoms of lateral epicondylitis

A

tenderness/pain @ lat epicondyle

49
Q

What is drop wrist

A

patient cannot extend hand due to damage and/or paralysis of radial nerve

50
Q

What is transient nerve palsy also known as

A

Saturday night palsy

51
Q

What causes transient nerve palsy? What happens?

A

leaning over surface (ie chair) causes compression of radial nerve in axilla or upper arm in patient sleeping causing drop wrist

MSAK-1 (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions