Eyelid

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Eyelid

The eyelid (pronounced: /ˈaɪˌlɪd/) is a thin fold of skin that covers and protects the human eye. The eyelid's primary function is to shield the eye from dirt, dust and other potentially harmful debris.

Etymology

The term "eyelid" comes from the Old English ēaglid; ēage meaning "eye" and -lid meaning "cover".

Anatomy

The human eyelid features a number of components: the lacrimal apparatus, the tarsus, the levator palpebrae superioris muscle, and the eyelashes.

The lacrimal apparatus is responsible for producing tears, which keep the eye moist and remove any debris. The tarsus is a dense connective tissue that gives the eyelid its rigidity. The levator palpebrae superioris muscle is responsible for lifting the eyelid, while the eyelashes help to filter out dust and dirt.

Related Terms

  • Blepharitis: Inflammation of the eyelid, often caused by bacterial infections, allergies, or dry eyes.
  • Ptosis: A drooping or falling of the upper or lower eyelid.
  • Entropion: A condition in which the eyelid folds inward.
  • Ectropion: A condition in which the lower eyelid turns outwards.
  • Chalazion: A cyst in the eyelid due to a blocked oil gland.
  • Stye: A red, painful lump near the edge of the eyelid that may look like a boil or pimple.

External links

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