Art Anatomy


Pronuncation in-fruh-spine-ATE-us
Derivation Below (infra) the spine (of the scapula).
Origin A wide area on the surface of the scapula below the spine.
Insertion Posterior side of the head of the humerus.
Action Rotates the upper arm laterally (outward).

Infraspinatus forms a flat, oblique bulk on the scapula when tensed. Though triangular, with fibers running toward the point of the shoulder, about half of the muscle is covered by deltoid and its triangularity can only be hinted at in a drawing.

Teres ("TEH-reez") minor is a small muscle running along with the outer edge of infraspinatus. It can be safely grouped with its larger neighbor, and the break between them is visible but rarely.

Previous: The Scapular muscles

Next: Teres Major

Table of Contents