What movement does the supraspinatus perform?

The supraspinatus muscle functions to initiate abduction and depress the humeral head against the upward pull of the deltoid. The muscle and tendon travel slightly obliquely from posterior to anterior, allowing it to contribute to external rotation as well.

Does the supraspinatus externally rotate?

The supraspinatus muscle compresses, abducts, and generates a small external rotation torque on the glenohumeral joint.

What movement does the subscapularis perform?

The subscapularis rotates the head of the humerus medially (internal rotation) and adducts it; when the arm is raised, it draws the humerus forward and downward. It is a powerful defense to the front of the shoulder-joint, preventing displacement of the head of the humerus.

What movements use the rotator cuff?

During arm movements, the rotator muscles contract and prevent the sliding of the head of the humerus, allowing full range of motion and providing stability. Additionally, rotator cuff muscles help in the mobility of the shoulder joint by facilitating abduction, medial rotation, and lateral rotation.

What is the supraspinatus fossa?

Anatomical terms of bone The supraspinous fossa (supraspinatus fossa, supraspinatous fossa) of the posterior aspect of the scapula (the shoulder blade) is smaller than the infraspinous fossa, concave, smooth, and broader at its vertebral than at its humeral end. Its medial two-thirds give origin to the Supraspinatus.

What limits shoulder external rotation?

Ligaments. Superior Glenohumeral Ligament: Limits external rotation and inferior translation of the humeral head. Arises from the glenoid and inserts on the anatomical neck of the humerus.