Shoulder

Question 1

Rotator cuff muscles or “SITS” muscles

Answer 1

Supraspinatus (super = top) abducts the arm snd can lift the arm alone even if the deltoid is paralyzed

Infraspinatus - performs external rotation

Teres Minor - performs external rotation

Subscapularis (underneath) - internally rotates and adducts the arm

Question 2

Shoulder has more than one joint and two important but contrasting function

Answer 2

Flexible but also provide strong stable fixed point

Huge range of motion - super flexible and super stable

Question 3

Shoulder complex is made up of three bones:

Answer 3

Clavicle (collar bone) - most frequently broken bones

Scapula (shoulder blade)

Humerus (bone of arm)

Question 3

Muscles of the Scapula

Answer 3

Serratus anterior - covers the lateral rib cage and helps to hold the scapula in place (Abduction and rotation)

Subclavis - depresses the clavicle

Pectoralis minor - helps stabilize the scapula and pulls it down and forward

Levator scapulae - elevates and downwardly rotates the scapula

Rhomboids - adducts the scapula and assists in downward rotation

Trapezius - large diamond shaped muscle that adducts the scapula

Question 4

Three joints of shoulder

Answer 4

Glenohumeral joint - primary joint located between head of humerus and glenoid cavity of scapula - extremely mobile but not very stable

Sternoclavicular joint - located at the medial end of the clavicle and allows flexion, extension, elevation, and depression and limited rotation of the clavicle

Acromioclavicular joint - saddle joint and is located at the lateral end of the clavicle and allows some gliding movement

Question 5

Movement of scapula

Answer 5

Elevation

Depression

Lateral rotation

Medial rotation

Rotation downward

Rotation upward