DEFINITION – What does Infraspinatus mean?
One of the four muscles of the rotator cuff, the infraspinatus is a thick, triangular muscle which is separated from the teres minor and major muscles by the infraspinatous fascia. This muscle covers the majority of the large, posterior infraspinatous fossa of the scapula.
FUNCTION – Infraspinatus Muscle
Often connected to the teres minor, this muscle is focused on stabilizing the shoulder joint and externally rotating the humerus (laterally rotating your arm), while modulating deltoid movement. It receives control signals (innervation) from the upper and lower supascapular nerves.