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Anatomy (TOPNOTCH SUPPLEMENT) > Shoulder Region > Flashcards

Flashcards in Shoulder Region Deck (13):
0

Articulation of the head of the humerus with the glenoid fossa of the scapula

Glenohumeral joint

1

2 prominent bursae

Subacromial bursa

Subscapular bursa

2

Separates the tendon of Supraspinatus from the deltoid muscle

Subacromial bursa

3

Separates the scapular fossa from the tendon of subscapularis muscle

Subscapular bursa

4

Contributes to the stability of the glenohumeral joint along with the tendon of the long head of biceps brachii muscle

Supraspinatus muscle - subscapularis nerve

Infraspinatus muscle - suprascapular nerve

Teres minor muscle - Axillary nerve

Subscapularis muscle - suprascapular nerve

Rotator cuff

5

Rotator cuff injury

MC: tendon of supraspinatus muscle & subscromial bursa

SSX: pain on lifting the arm above the head

6

Anterior or inferior dislocation of the humerus

MC type of shoulder dislocation

Humeral head lies anterior & inferior to the coracoids process of scapula --> may damage the axillary nerve or artery

SSX: loss of normal round contour of the shoulder, palpable depression under the acromion, ability to palpate the head of the humerus in the axilla

7

Articulation of the lateral end of clavicle with the acromion of the scapula

Stabilized by:
- coracoacromial ligament
- coracoclavicular ligament (coronoid & trapezoid)
- acromioclavicular ligament

Acromioclavicular joint

8

Shoulder separation

Cause: downward blow at the tip of the shoulder

Acromioclavicular subluxation

9

Ligament: no tear

Joint space: normal

Grade I subluxation (minor sprain)

10

Ligament: + tear acromioclavicular ligaments

Joint space: 50% wider

Grade II subluxation

11

Ligament: + tear in coracoclavicular & acromioclavicular ligaments

Joint space: 50% wider

SSX: injured arm is lower than the normal arm, bulge at the top of shoulder (upward displacement of clavicle)

Depressing and then releasing the lateral end of the clavicle causes a rebound ("piano key sign")

X-ray with 10lbs weight on the injured side: marked separation of acromion from the clavicle

Grade III subluxation

12

Fracture of the clavicle

MC: middle third of clavicle

Causes: upward displacement of proximal fragment as a result of pull of SCM muscle & downward displacement of distal fragment due to pull of deltoid muscle

Subclavian artery & vein are at risk for injury