These muscles arise from either a shoulder bone & attach to the head of the humerus forming a cuff at shoulder joint. It is crucial because it hang on to a head of the humerus in the microscopic & shallow glenoid fossa of the scapula. the glenohumeral joint is typically compared to the golf game ball sitting in a golf tee. In a period of elevation of a arm, a rotator cuff compresses a glenohumeral joint sequentially to allow the big deltoid muscle to farther elevate the arm. Within more words, forswearing a rotator cuff, a humeral head would ride higher part away from a glenoid fossa & a efficiency of the deltoid muscle would become good deal less.

A iv muscles that compose this class action come: Supraspinatus muscle, which comes from a supraspinous fossa of the scapula. This abducts a arm. Infraspinatus muscle, which comes from a infraspinous fossa of the scapula. This laterally rotates a arm. Teres minor muscle, comes from a lateral border of the shoulder blade, & likewise laterally rotates a arm. Subscapularis muscle, originating from a subscapular fossa of the scapula. This muscle medially rotates a humerus.

This class action of sinew potty be torn, leading to pain and restricted movement of the arm. The torn rotator even cuff may occur as the consequence a trauma to the shoulder or it might occur across "wear and tear" of a sinew under the acromial process.

The mnemonic to remember what muscles form the rotator cuff is SITS (supraspinatus, infraspinatus, teres minor, subscapularis) - somebody by using the rotator cuff injury sits out.