Shoulder Anatomy
Name the bones involved in the shoulder joint.
Scapula, clavicle, humerus.
What is the movement combination called scapulohumeral rhythm?
Combined movement of GH (glenohumeral) and ST (scapulothoracic) joints in a 2:1 ratio.
Name the four rotator cuff muscles.
Supraspinatus, infraspinatus, teres minor, subscapularis.
What is the most common type of GH joint dislocation?
Anterior dislocation.
What is the shallow socket of the scapula called?
Glenoid cavity.
What muscle is the prime mover for shoulder flexion?
Anterior deltoid.
Which two rotator cuff muscles are responsible for external rotation of the shoulder?
Infraspinatus and teres minor.
What mechanism causes AC joint sprains?
Fall or collision driving the acromion downward.
What is the only true joint connecting the upper limb to the axial skeleton?
Sterno-clavicular joint
Which rotator cuff muscle is responsible for abduction?
Supraspinatus.
Which rotator cuff muscle is located on the anterior surface of the scapula and performs internal rotation?
Subscapularis.
What is shoulder impingement syndrome?
Compression of the rotator cuff tendons in the subacromial space
What ligament stabilizes the acromioclavicular joint?
Coracoclavicular ligament.
What "winged-shaped" muscle performs shoulder extension, adduction, and internal rotation?
Latissimus dorsi.
What is the role of the rotator cuff?
Stabilize the glenohumeral joint.
What grade of acromioclavicular (AC) joint sprain involves a complete tear of the AC and coracoclavicular ligaments?
Grade III.