Brainscape's Knowledge GenomeTM

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


See full index

MBCHB MSS > lecture 7: Shoulder and Elbow > Flashcards

lecture 7: Shoulder and Elbow Flashcards

1
Q

What are the features that permit a wide range of motion for the shoulder joint? (LO1)

A

the articular surface of the humerus head is considerably larger than the glenoid fossa

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

what is the common site of fracture in the head of the humerus?

A

surgical neck

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

what is the name of the structure around the glenoid fossa that softens and deepens its edge?

A

glenoid labrum

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

what muscles originate at the supraglenoid and infra glenoid tubercles?

A

supraglenoid tubercle- ‘O’ of the long head of bicep brachii
infra glenoid tubercle- ‘O’ of the long head of triceps

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

what are the rotator cuff muscles?

A

subscapularis, teres minor, supraspinatus, and infraspinatus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what ligament reinforces the shoulder joint capsule superiorly?

A

coracohumeral

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

where do most shoulder dislocations happen?

A

anteriorly and inferiorly

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

which ligament holds down the tendon of the long head of the bicep?

A

traverse humeral ligament

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is the role of

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

what are the chief abductors of the shoulder?

A

Supraspinatus and deltoid(multipennate central fibres)

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

which muscle prevents upward displacement of the head of the humerus?

A

teres minor and major

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

what is the chief lateral rotator of the shoulder

A

infraspinatus
teres minor
Posterior deltoid

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

what are the chief internal rotators(and adductors)?

A

subscapularis
pectoralis major
teres major
Latissimus dorsi

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

what muscles flex the arm on the shoulder?

A

clavicular fibres of pec major
anterior fibers of deltoid

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

what muscles extend the arm at the shoulder joint?

A

posterior fibers of deltoid latissimus dorsi
Teres major
Long head of triceps
Steenocostal portion of pectoralis major

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

what is the weakest position of the shoulder joint

A

when the arm is abducted only the tendon of the long head of the triceps(which originates at the infra glenoid tubercle) is supporting the head of the humerus inferiorly.

e.g fall on extended arm

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

‘O’ and ‘I’ of infraspinatus, supraspinatus, and teres minor

A

infraspinatus:

‘O’-infraspinous fossa
‘I’-middle facet of greater tubercle

Supraspinatus:

‘O’-supraspinous fossa
‘I’-superior facet of greater tubercle

Teres minor:
‘O’-lateral border of scapula
‘I’-inferior faceet of greater tubercle

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

‘O’ and ‘I’ subscapularis

A

O:Subscapular fossa
I:lesser tubercle of humerus

22
Q

what nerve innervates teres minor?

A

axillary n

23
Q

what nerve innervates infraspinatus and supraspinatus?

A

subscapular nerve

24
Q

what nerve innervates subscapularis?

A

upper&lower subscapular n

25
Q

what is the action of the subscapularis

A

internally rotates the arm

26
Q

main function of supraspinatus

A

abduct the arm

27
Q

main function of infraspinatus and teres minor

A

externally rotate arm

28
Q

subscapularis: ant or post?

A

anterior

29
Q

what nerve innervates teres major?

A

lower subscapular nerve

30
Q

what is the order of insertions on the intertubercular groove?

A

most lateral-pec major
middle-lat.dorsi
most medial- teres major

31
Q

what are the bursas in the shoulder?

A

-subscapular bursa(lies under subscapularis tendon)
-subcoracoid bursa( under coracoid)
-subacromial bursa and subdeltoid bursa(continuation of each other)

32
Q

what provides active stabilisation of the shoulder ?

A

rotator cuff muscles

33
Q

what muscles are innervated by the suprascapular nerve?

A

supraspinatus, infraspinatus

34
Q

what does the subscapular nerve innervate?

A

subscapularis

35
Q

what are the flexor/extensor joints of the elbow?

A

Humero-ulnar joint
Humero-radial joint

36
Q

what are the pronator/supinator joints of the elbow?

A

humero-radial
superior radio-ulnar joint

37
Q

what is the area on the condyle that is part of the humero-ulnar joint?

A

trochlea

38
Q
A
39
Q

what are the components of the humero-radial joint?

A

capitulum
superior surface of radius

40
Q

what is the function of the coronoid, olecranon, and radial fossas in the elbow?

A

increase the range of motion at the maximum flexion

41
Q

what is the role of ulnar and radial collateral ligaments in the elbow?

A

Ulnar prevent abduction of Ulna and Radial prevents adduction of radius

42
Q

where does the radial collateral ligament originate and insert?

A

O- lateral epicondyle
I- anular ligament of radius

43
Q

what is the role of anular ligament of radius?

A

runs from edge of radial notch, wraps around the head of the radius

allows the radius to rotate BUT prevents it from being pulled out inferiorly

44
Q

what is the function of the fat pads in the elbow?

A

Sit in the coronoid and olecranon fossas, reduce the amount of synovial fluid needed. Moved away during flexion.

45
Q

what happens if yank on a kid’s arm too hard?

A

can pull the head of the radius through the anular ligament
(because it takes a while to ossify)
can pop it back in

in adults- ossified and ligament is tough, so can cause more damage

46
Q

what is wrong here?

A

can see that the fat pads have moved out of the fossas

potential fracture leaking blood into the joint space-> lifting the fat pads

47
Q
A
48
Q

arm abductors at the shoulder joint

A

supraspinatus
deltoid middle part

49
Q

arm adductors at the shoulder joint

A
50
Q

arm flexors at the shoulder joint

A
51
Q

arm extensors at the shoulder joint

A
52
Q

internal and external rotators of the arm

A

internal:

lat. dorsi
teres major
pec. major
subscapularis
anterior deltoid

external:

teres minor
posterior deltoid
infraspinatus

MBCHB MSS (28 decks)

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