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What is All of the following muscles constitutes the rotator cuff muscles, EXCEPT: and explain in detail?
The 4 muscles which constitute the rotator cuff are supraspinatus, infraspinatus, teres minor and subscapularis. They form a musculotendinous cuff around the glenohumeral joint. It provides muscular suppo primarily to the anterior, posterior, and superior aspects of the joint.Supraspinatus muscle: Its primary action is humeral abduction. The suprascapular nerve (C5-C6) and the suprascapular aery provide its innervation and blood supply.Infraspinatus muscle: Its primary action is lateral rotation of the humerus. The suprascapular nerve and the suprascapular aery provide its innervation and blood supply.Teres minor muscle: It causes lateral rotation of the humerus. The axillary nerve and circumflex scapular aery provide its innervation and blood supply.Subscapularis muscle: Causes medial rotation of the humerus with contraction. Upper and lower subscapular nerves and suprascapular, axillary, and subscapular aeries provide its innervation and blood supply.REF: Moon D.A., Foreman K.B., Albeine K.H. (2011). Chapter 30. Shoulder and Axilla.