Inferior rectus muscle

The inferior rectus muscle is a muscle of the eye that sits behind and below the eye and turns the eye to look downward.

Action
When the eye is in a neutral position, the inferior rectus muscle depresses the eye to look downward. When the eye is adducted, it lateral|laterally rotates the eye.

Origin
The inferior rectus originates from the lower part of the annulus of Zinn at the back of the eye socket.

Insertion
The inferior rectus inserts at the base of the eye, on the inferior sclera just passed the equator of the eye.

Innervation
The inferior rectus is innervated by the inferior division of the oculomotor nerve (CN III).