Levator palpebrae superioris

The levator palpebrae superioris (also levator palpebrae superioris muscle or eyelid muscle, latin: musculus levator palpebrae superioris) is an extra-ocular muscle of the eyeball that lies within the orbit and elevates the upper eyelid.

Origin

The levator palpebrae superioris originates from the inferior aspect of the lesser wing of the sphenoid, 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 levator palpebrae superioris to superior rectus, thus the upper eyelid elevates also when the gaze of the eye is directed upwards. The levator palpebrae superioris is responsible for opening the eyelids and, upon relaxation, allows lid 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 blood supply to the levator palpebrae superioris is provided by the ophthalmic artery.