Rotator Cuff Muscles

Name the 2 actions of the supraspinatus muscle

1. Abduction of the glenohumeral joint 2. Stabilization of the humeral head in the glenoid fossa

Name the 4 Actions of the Teres Minor

1. External rotation of the glenohumeral joint 2. Horizontal abduction of the glenohumeral joint 3. Extension of the glenohumeral joint 4. Stabilization of the humeral head in the glenoid fossa

Name the 4 actions of the Infraspinatus muscle

1. External rotation of the glenohumeral joint 2. Horizontal abduction of the glenohumeral joint 3. Extension of the glenohumeral joint 4. Stabilization of the humeral head in the glenoid fossa

Name the 4 actions of the Subscapularis muscle

1. Internal rotation of the glenohumeral joint 2. Adduction of the glenohumeral joint 3. Extension of the glenohumeral joint 4. Stabilization of the humeral head in the glenoid fossa

Name the ORIGIN of the Subscapularis muscle

Entire anterior surface of the subscapular fossa

Name the INSERTION of the Infraspinatus muscle

Greater tubercle on the posterior side of the humerus

What function does the rotator cuff muscles perform in the body?

Keeps the humeral head in the glenoid cavity

Name the INSERTION of the Subscapularis muscle

Lesser tubercle of the humerus

Name the ORIGIN of the supraspinatus muscle

Medial two-thirds of the supraspinous fossa

Name the ORIGIN of the Infraspinatus muscle

Posterior surface of the scapula below the spine

Name the INSERTION of the Teres Minor

Posteriorly on the greater tubercle of the humerus

Name the ORIGIN of the Teres Minor

Posteriorly on the upper and middle aspect of the lateral border of the scapula

What muscles make up the rotator cuff?

SITS supraspinatus infraspinatus teres minor subscapularis

Name the INSERTION of the supraspinatus muscle

Superiorly on the greater tubercle of the humerus

What is rotator cuff impingement sydrome?

Tendons of the muscles (usually supraspinatus and infraspinatus) become irritated and inflamed as they pass through the subacromial space Causes pain, weakness, and loss of movement at the shoulder