Figure 1. Anatomy of the eye, eyelid, and lacrimal glands.

Eyelid

The eyelid protects the eye against abrasion, and to some degree against most types of insults.

Muscles

  • The orbicularis oculi muscle is a skeletal muscle that controls the movement of the eyelid, while the tarsal muscle is a smooth muscle attaching to a special flexible plate -- the tarsal plate
  • The levator palpebrae superior muscle is another skeletal muscle that is

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