Infraspinatus muscle

The Infraspinatus muscle is one of the four rotator cuff muscles crossing the shoulder joint and is commonly injured. It is the main external rotator of the shoulder joint.

Origin - Posterior surface of the scapula (below the spine of the scapula).

Insertion - Greater tuberosity on the humerus.

Actions - Shoulder horizontal abduction.
External rotation. Shoulder extension

Innervation - Suprascapular nerve.

Daily uses - Brushing hair.

Example strengthening exercises - Lateral raise.
Shoulder external (lateral) rotation.

Example stretches - Internal rotation stretch.
Posterior shoulder stretch.

Related muscles categories: