Supraspinatus - Musculus supraspinatus
Origin: Supraspinous fossa ofscapula
Insertion: Superior facet of greater tubercle ofhumerus
Artery: Suprascapular artery
Nerve: Suprascapular nerve
Action: Abduction of arm and stabilizes humerus
Antagonist: Infraspinatus, teres minor, pectoralis major, andlatissimus dorsi
The Supraspinatus occupies the whole of the supraspinatous fossa, arisingfrom its medial two-thirds, and from the strong supraspinatous fascia. The muscular fibers converge to a tendon, which crosses the upper part of the shoulder-joint, and is insertedinto the highest of the three impressions on the greater tubercle of the humerus; the tendon is intimately adherent to the capsule of the shoulder-joint.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).