www.vipdeals.info Visit now to learn more about rotator cuff exercises. The rotator cuff muscles are important in shoulder movements and in maintaining glenohumeral joint (shoulder joint) stability. [1]These muscles arise from the scapula and connect to the head of the humerus forming a cuff at the shoulder joint. They hold the head of the humerus in the small and shallow glenoid fossa of the scapula. The glenohumeral joint is often likened to a golf ball(head of the humerus) sitting on a golf tee(glenoid fossa). During abduction of the forearm, the rotator cuff compresses the glenohumeral joint in order to allow the large deltoid muscle to further elevate the arm. In other words, without the rotator cuff, the humeral head would ride up partially out of the glenoid fossa, lessening the efficiency of the deltoid muscle. During flexion of the forearm infraspinatus and subscapularis act as joint stabilizers. During extension subscapularis and supraspinatus help stabalise the shoulder joint. Subscapularis stabalizes the joint during external rotation.[
