Shoulder Complex Joint

Question 1

Sternoclavicular Joint

Answer 1

Medial end of clavicle and sternum

Question 2

Acromioclavicular Joint

Answer 2

Lateral end of clavicle and the acromion of the scapula

Question 3

Scapulothoracic Joint

Answer 3

Not a true joint; combination of sternoclavicular and acromioclavicular joint

Question 4

Glenhumeral Joint

Answer 4

Head of humerus and the glenoid fossa

Question 5

Movement of each

Answer 5

1) Sternoclavicular Joint- 3 axes of rotation
2) Acromioclavicular Joint- Upward and downward rotation
3) Scapulothoracic Joint- Elevation/depression, protraction/retraction, upward/downward rotation
4) Glenohumeral Joint- ball-and-socket joint

Question 6

Coraclavicular Ligament

Answer 6

-A short, strong ligament that connects the coracoid process of the scapula (shoulder blade) to the clavicle (collarbone).
- Tear comes from falling/striking the tip of shoulder against the ground

Question 7

Anterior Band

Answer 7

-Strongest/thickest part of shoulder capsule
-Most taut at 90 degrees abduction
- Add further tension with external rotation
“Cocking” baseball can overstretch anterior band

Question 8

Glenoid Labrum

Answer 8

-Fibrocartilage ting that encircles the glenoid fossa
-Helps stabilize the joint
-Increases contact area with humeral head

Question 9

Difference between shoulder girdle muscles and shoulder joint muscles

Answer 9

-Shoulder girdle muscles attatch to clavicle or scapula, not to the humerus
-Shoulder girdle muscles do not partake in shoulder movement