The muscle that keeps the eyes open and opens the eye is the levator palpebrae muscle and is also innervated by CN3.
The muscle that close the eye is the orbicularis muscle and is innervated by CN7.
The orbicularis oculi muscles circle the eyes and are located just under the skin.
Parts of this muscle act to open and close the eyelids and are important muscles in facial expression.
Six of the extraocular muscles, the four recti muscles, and the superior and inferior oblique muscles, control movement of the eye.
As most people fall asleep, the eyelids naturally close completely when facial muscles relax.
People might sleep with their eyes open if they were born with eyelids that don't close completely.
The eyelid muscles are damaged by infection, inflammation or injury.
There are six extraocular muscles that control all of the movement of the eye. T
hese muscles are the superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique, and inferior oblique.
The superior oblique eye muscle originates from the sphenoid bone, which is one of the seven bones that make up the eye socket.
It is controlled by the fourth cranial nerve (trochlear nerve).
The eye sits in a protective bony socket called the orbit.
Six extraocular muscles in the orbit are attached to the eye.
These muscles move the eye up and down, side to side, and rotate the eye.
The extraocular muscles are attached to the white part of the eye called the sclera.