Which cranial nerve is primarily responsible for the movement of the eyelids?

The cranial nerve primarily responsible for the movement of the eyelids is the oculomotor nerve. This nerve is the third cranial nerve and plays a key role in controlling most of the eye's movements, including the elevation of the upper eyelid. One of its specific functions is to innervate the levator palpebrae superioris muscle, which is crucial for lifting the eyelid. When the oculomotor nerve is functioning correctly, it allows for proper eyelid closure and opening, contributing to a full range of eye movements. Dysfunction of this nerve can lead to ptosis, or drooping of the eyelid, highlighting its importance in eyelid mobility.