Infraspinous fossa

Definition

The infraspinous fossa is a large, slightly concave surface on the posterior aspect of the scapula, below the spine of the scapula. It serves as a site for muscle attachment, specifically for the infraspinatus muscle.

Related terms

Scapula:

A flat triangular bone that serves as a major part of the shoulder assembly, connecting the humerus (upper arm bone) with the clavicle (collarbone).

Infraspinatus Muscle: A thick triangular muscle occupying most of the infraspinous fossa, which helps in lateral rotation of the arm at the shoulder.

Spine of Scapula:

A prominent plate-like ridge of bone on the posterior surface of the scapula that divides its back side into two parts - one being above (supraspinous fossa) and one below (infraspinous fossa)