Infraspinatus

Diagram of Posterior Muscles of the Human Body

The infraspinatus muscles are a pair of deep muscles, one on each side of the body, located below the spine of the scapula, which is a feature on the scapula (shoulder bone). These can be studied in relation to the supraspinatus muscles, which are located above the spine of the scapula, on the scapula bone.

The infraspinatus muscles are among the four rotator cuff muscles (on each side of the body) that help to support the head of the humerus in place in the glenoid cavity. The rotator cuff muscles are listed below.

Origin, Insertion and Actions of the Infraspinatus muscles:

Point(s) of Origin:
Point(s) of Insertion:
Action(s):
  • Laterally rotates the humerus bone

The infraspinatus muscles are labelled on the diagram of human posterior muscles.

More about Muscles:

The following are some popular pages in the section about the human muscular system:

There are also more pages about the words used to describe muscles (terminology), the anatomy and physiology of muscles, muscular disorders and associated topics. See also books about sports medicine.

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