Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

becky: MSK UQ > LECTURE 7A: SHOULDER ANATOMY > Flashcards

LECTURE 7A: SHOULDER ANATOMY Flashcards

(69 cards)

Start Studying
1
Q

4 joints in the shoulder complex

A

Gleno-humeral joint (golf ball and T)
Acromio-clavicular joint
Sterno-clavicular joint
Scapulo-thoracic joint

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

What is the primary function of the shoulder?

A

position hand in space to permit upper limb to interact w/ environment and perform wide range of activities

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

what is the secondary function of the shoulder?

A
  1. suspend UE
  2. provide sufficient fixation for motion of UE/trunk
  3. serve as fulcrum for arm elevation (scaption, abduction, flexion)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The GH joint is a ____ joint

A

true synovial, ball and socket

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

capsular pattern of the GH joint

A

ER, ABD, IR

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

Closed packed position of shoulder

A

90 ABD or full, full ER

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

open packed position of shoulder

A

55 degrees of abduction, 30 degrees of adduction, (maybe slight IR)

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

What is the last motion you get when you injure shoulder

A

Internal rotation

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

passive structures of the GH joint

A
  1. labrum
  2. capsule
  3. ligaments
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

active structures of the GH joint

A

rotator cuff
scapular muscles
muscles blend into each other!

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

What stabilizes the GH joint?

A

concavity of glenoid fossa (negative pressure, adhesions)
labrum
ligaments
muscles
mechanoreceptors

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

labrum is ___ and _____, and made of __cartilage

A

avascular, aneural
made of fibrocartilage

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

labrum aids in ____ to glenoid

A

attaching GH ligaments

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

T or F: capsule is large, loose, and not very stable

A

true

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

normal volume of the shoulder capsule

A

10-15 ml

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

fluid volume in GH capsule with adhesive capsulitis

A

5-10 ml

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

fluid volume with GH capsule with capsular laxity

A

up to 30 mL

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

GH ligaments are _____ rather than isolated structures

A

capsular thickenings (not super concrete, not very stable!)

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

superior GH ligament is taut when

A

arm by side (0 degrees abduction)

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

SGHL is covered by

A

coraco-humeral ligament

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

some people (30% of people) don’t have a middle GH ligament. What does the MGHL do?

A

true (supposed to provide 2ndary restraint to anterior translation)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

When this ligament is incompetent, humeral head will sublux inferiorly

A

SGHL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

inferior GH ligament is the main static stabilizer of the ____

A

abducted shoulder
(also rotation in abduction –> IGHL fans out to support humeral head)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

inferior GH ligament is made of

A
  1. anterior band
  2. posterior band
  3. axillary pouch
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
inferior band of the inferior GH ligament fans and rotates ___ with rotation
anterior (hammock)
26
posterior ligaments are ___
THIN, not helpful that much (mostly stable through muscles)
27
Provides stability to humeral head when arm abducted 90° and IR
posterior band of IGHL
28
MAIN JOB OF rotator cuff
the transverse abs of the shoulder! CORSET stabilizes GH joint when other large mm contract, assist with arm elevation
29
rotator cuff acts as force couple with ___ muscle
deltoid
30
3 jobs of the rotator cuff
1. control motion 2. rotate humeral head 3. STABLIZE HUMERUS IN GLENOID (CORSET)
31
what are the 3 force couples of the shoulder
1. Rotator cuff – deltoid 2. Upper/lower trapezius – serratus anterior 3. Anterior – posterior rotator cuff
32
Dynamic stability of GH joint achieved through contraction of RC muscles and ____
biceps
33
___ couple offers compression of convex-concave joint surfaces, decreasing translation
anterior/posterior RC force couple
34
T or F: passive structures are reinforced through direct attachment of RC tendons to provide dynamic stability
T
35
can you have all the muscles in the shoulder and it still play out of tune?
yes! like a band, need everyone in tune. NM control via proprioception
36
with your arm by the side, subacromial space is about ____ mm
10-11 mm
37
when arm elevates, sub acromial space is ____
narrowed most narrow at 60-120 degrees elevation
38
If you ahve osteophyte, acromion hook, swollen rotator cuff tendon, what happens with the shoulder sub-acromial space?
impingement
39
position of the GH joint (ER vs IR) changes impingement. Why?
The tubercles! greater and lesser w/ all mm attachements ER: not under acromion, escape! cleared IR: under acromion, LESS SPACE
40
What tendon is the most involved in overuse syndromes
supraspinatus
41
Muscle imbalances and capsular stiffness can ____ superior migration of humeral head
increase
42
Glenoid covers ____of humeral head
quarter to a third
43
AC joint is a ___ joint
true synovial, plane joint (glides
44
closed pack of AC joint
90 degrees abduction
45
capsular pattern of AC joint
extreme ROM ends (elevation) * AC doesnt matter if someone rolls in with like 90 degrees of elevation
46
Main articulation that suspends UE from trunk
AC joint
47
primary support for AC joint
Coraco-clavicular ligament (2 parts: conoid and trapezoid)
48
someone "separated" their shoulder - what did they tear?
coraco-clavicular
49
Only joint that connects shoulder girdle to axial skeleton
sterno-clavicular joint
50
sterno-clavicular joint is a ___ joint
true synovial, saddle/plane joint
51
closed packed position of sterno-clavicular joint
max elevation and protraction
52
capsular pattern of the sterno-clavicular joint
extreme end ROM (especially elevation and horz ADDuction)
53
AC joint ___dislocation 9X more common than ____dislocations, although only 3% of shoulder injuries overall (sterno-clavicular joint)
Anterior dislocation 9X more common than posterior dislocations, although only 3% of shoulder injuries overall
54
AC and SC joints are mainly controlled by -__ structures
passive!
55
scapulothoracic joint has stability through
no real passive just active structures
56
B/c of bony arrangement, SC joint inherently weak. secured by ___
super strong ligaments
57
scapulo-thoracic joint is considered a ___ joint
false joint
58
OPP: Scapulo-thoracic Joint
w/ arm at neutral – scapula positioned 30-45° IR, slight upward rotation and 5-20° anterior tipping
59
review scapulo-humeral rhythm: 3 phases
phase 1: -30 degree humeral elevation (clavicle 0-5) phase 2: -humerus: 40 abduction -scapula 20 upward rotation + min protraction/elevation -clavicle: 15 elevation phase 3: -humerus: 60 abduction, 90 ER -scapula: 30 upward rotation -clavicle: 30-50 posterior rotation, up to 15 elevation
60
what is reverse Scapulo-humeral Rhythm
1. scap moves more than humerus (2:1 rhythm) 2. often seen in patients with adhesive capsulitis, RC tears 3. patient appears to be hiking shoulder w/ minimal abduction
61
Sympathetic nerve supply originates from___ to ___
Sympathetic nerve supply originates from T2-8
62
you see a lot of biceps tendinopathy and supraspinatus tendinopathy. Why?
not very well vascularized (kinda avascular) -perfusion can change w/ positions
63
Nerve supply of shoulder: Embryologically derived from
C5-C8 ac joint: C4
64
Where is the vascular supply to the shoulder complex from?
mostly axillary artery branches
65
What artery supplies both heads of biceps
brachial artery
66
GH joint: CPP OPP Capsular pattern
CPP: 90-90 or full ER/ABD OPP: 55 abd, 30 horz ADD, neutral rotation or maybe tiny bit IR capsular: ER > ABD> IR
67
AC joint: CPP, OPP, Capsular pattern
CPP: 90 ABD OPP: unknown (arm at side?) Capsular: pain w/ extreme ROM/elevation
68
SC joint: CPP, OPP, Capsular pattern
CPP: full elevation/protraction OPP: arm at side? unknown capsular: extreme ROM
69
ST joint: OPP, CPP, Capsular pattern
CPP: none OPP: 5-20 anterior tip, slight upward rotation, 30-45 IR capsular: none

becky: MSK UQ (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions