01 / Location & anatomical relationships
In front of each eye, with an upper and a lower lid.
02 / Structure & organization
Each eyelid contains skin, muscle, a supportive tarsal plate and an inner conjunctival lining. Meibomian glands in the tarsal plates supply lipids to the tear film. Orbicularis oculi closes the lids; levator palpebrae superioris elevates the upper lid.
03 / Function
Blinking spreads tears across your eyes to keep them moist.
04 / Mechanism
Muscles lift a lid to open the eye and draw the lids together to close it. Each blink spreads a thin tear film over the cornea. This smooth, moist surface helps the eye focus light clearly.
Part of a bigger picture
The eyelid belongs in our head & face collection. Explore the nearby parts to see how this area of the body fits together.
Explore head & face →FOR DEEPER STUDY
Connect structure with function
The facial nerve powers lid closure, while the oculomotor nerve supplies the main upper-lid elevator. Blinking distributes tears and directs them toward drainage openings near the medial eyelid margins.
Check your understanding
Locate the eyelid in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.