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Inferior rectus

The inferior rectus (also inferior rectus muscle, inferior rectus extraocular muscle, latin: musculus rectus inferior) is one of the six extra-ocular muscles that are in control of eye movements. Actions of the inferior rectus result in moving the visual gaze down and in.

Origin

The inferior rectus originates from the common tendinous ring, below the optic canal. 

Insertion

The inferior rectus inserts obliquely into the sclera below the cornea, approximately 6.5 mm behind the corneal limbus.

Action

The contractions of the inferior rectus provide the depression and lateral rotation of the eyeball.

Innervation

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

Blood supply

The blood supply to the inferior rectus is provided by the ophthalmic artery and the infraorbital branch of the maxillary artery.