Levator palpebrae superioris

The levator palpebrae superioris (Latin: musculus levator palpebrae superioris), also called the eyelid muscle, is an extraocular muscle that lies within the orbit and elevates the upper eyelid.

Origin

The fibers of the levator palpebrae superioris originate from the inferior aspect of the lesser wing of the sphenoid bone, above and in front of the optic canal.

Insertion

The levator palpebrae superioris inserts into the tarsal plate of the upper eyelid.

Action

The main action provided by the levator palpebrae superioris is elevating the upper eyelid. A ligament connects the levator palpebrae superioris to the superior rectus, thus the upper eyelid elevates also when the gaze is directed upwards.

The levator palpebrae superioris is responsible for opening the eyes by lifting the upper eyelid and, upon relaxation, allows eyelid closure due to gravity.

Innervation

The levator palpebrae superioris is innervated by a branch of the superior division of the oculomotor nerve (CN III).

Blood supply

The arterial blood supply of the levator palpebrae superioris is provided by the ophthalmic artery.