Infraspinatus

Definition

The infraspinatus is a thick, triangular muscle located in the upper back, part of the rotator cuff that helps with the rotation and stabilization of the shoulder joint. It covers part of the scapula (shoulder blade) and attaches to the humerus (upper arm bone).

Related terms

Rotator Cuff: A group of muscles and tendons that surround the shoulder joint, providing stability and allowing a wide range of motions.

Scapula:

A flat, triangular bone that serves as a vital part of the shoulder complex, providing attachment points for several muscles including the infraspinatus.

Humerus:

The long bone in the upper arm that extends from the shoulder to the elbow, connecting with muscles like the infraspinatus to facilitate arm movement