The levator palpebrae superioris is a thin, flat muscle in the upper eyelid. It originates from the lesser wing of the sphenoid bone, a bone located at the base of the skull, and inserts into the skin and connective tissue of the upper eyelid. The levator palpebrae superioris muscle is responsible for elevating the upper eyelid and opening the eye. The muscle is innervated by the oculomotor nerve (cranial nerve III) and works in conjunction with other muscles of the eye, such as the orbicularis oculi muscle, to produce efficient eye movements during various activities, such as reading or driving. Dysfunction or weakness of the levator palpebrae superioris muscle can lead to difficulties with opening the eye and may contribute to drooping of the upper eyelid, a condition known as ptosis.