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A B M P m e m b e r s e a r n F R E E C E a t w w w. a b m p . c o m / c e b y r e a d i n g M a s s a g e & B o d y w o r k m a g a z i n e 45 FUNCTIONAL ANATOMY education The supraspinatus is a relatively small muscle located deep to the trapezius and deltoid on the shoulder. The muscle belly is located in the supraspinous fossa, just superior to the spine of the scapula. The muscle runs horizontally from the superior angle of the scapula laterally to the acromion process. Here, the tendon drops deep to the acromion process, crosses the glenohumeral joint superiorly, then descends and inserts on the greater tubercle of the humerus. The supraspinatus is one of four muscles of the shoulder that make up the rotator cuff. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles surround and function as a unit to stabilize the humeral head in the glenoid fossa. Each muscle has a specific role in positioning and steering the head of the humerus as the arm moves into different positions. Without the rotator cuff dynamically stabilizing this highly mobile, ball-and-socket joint, the humeral head would collide with surrounding bony structures such as the acromion process superiorly or coracoid process anteriorly and medially. This may result in compression of adjacent soft tissues and associated damage to bursae, tendons, Supraspinatus By Christy Cael SUPRASPINATUS Attachments • Origin: Supraspinous fossa of the scapula • Insertion: Greater tubercle of the humerus Actions • Initiates abduction of the shoulder Innervation • Suprascapular nerve • C5–6 Supraspinatus muscle Acromion process Infraspinatus muscle Tendon of Infraspinatus Coracoid process Pectoralis minor Tendon of supraspinatus Deltoid muscle