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The infraspinatus is a thick triangular muscle that occupies much of the infraspinous fossa of the scapula. It is a member of the rotator cuff, commonly remembered by the mnemonic “SITS” (supraspinatus, infraspinatus, teres minor, subscapularis). These muscles contribute to help form the glenohumeral joint, which aids in shoulder joint motion and stability. These muscles allow the shoulder joint to have stability while being one of the most mobile joints in the body. The main functions of the infraspinatus are assisting in external rotation of the shoulder joint, scaption, and lateral rotation of the humerus.[1][2][3][4]