Diagram of posterior muscles.

The subscapularis 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 (on each side of the body) are listed below.

Origin, Insertion and Actions of the Subscapularis muscles:

Point(s) of Origin:
Point(s) of Insertion:
  • Lesser tubercle at the top of the humerus (upper-arm) bone.
  • Stabilizes the shoulder joint (as part of the rotator cuff)
  • Medially rotates the humerus

The subscapularis muscles are not labelled on the diagram of human anterior muscles because they are deep muscles located beneath other muscles shown on that page.

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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