Inferior oblique

The inferior oblique (also obliquus inferior, inferior oblique muscle, inferior oblique extraocular muscle, latin: musculus obliquus inferior) is one of the six extra-ocular muscles that are in control of eye movements. The actions of the inferior oblique are responsible for moving the visual gaze up and out.

Origin

The inferior oblique originates from the maxillary bone, from the medial part of the floor of the orbit.

Insertion

The inferior oblique inserts into the posterior, inferior, and lateral surface of the eyeball.

Action

The actions of the inferior oblique include extortion (external rotation), elevation and abduction of the eye. The inferior oblique therefore turns the eye up and outwards with lateral rotation.

Innervation

The inferior oblique is innervated by a branch of oculomotor nerve (CN III).

Blood supply

The inferior oblique receives blood supplied from the ophthalmic artery.