-- Infraspinatus, a thick triangular muscle wrapped around the outside portion of the scapula — Teres minor,
a smaller mucle found under the infraspinatus — Supraspinatus, a muscle that runs from the scapula to the inside of the humerus, separated from the infraspinatus by the spine of the scapula — Subscapularis, another large triangular muscle that originates from the subscapular fossa of the scapula and inserts in the humerus.