NCIt definition : One of four rotator cuff muscles that form a musculotendinous cuff around the glenohumeral
joint, which provides muscular support to the shoulder. It originates on the subscapular
fossa with insertion onto the lesser tubercle of the humerus, and functions to medially
rotate the humerus.;
Alternative definition : CDISC: A muscle in the shoulder, in general extending from the subscapular fossa to
the lesser tubercle of the humerus; primary function is to medially rotate the humerus.;