Plica semilunaris of the conjunctiva

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Plica semilunaris of the conjunctiva
Front of left eye with eyelids separated to show medial canthus. (Plica semilunaris labeled at center left.)
Latin plica semilunaris conjunctivae
Gray's subject #227 1027
Dorlands/Elsevier p_24/12649244

The plica semilunaris is a small fold of bulbar conjunctiva on the inner corner of the eye. It is loose, so that eye movements are not restricted.

It is the vestigial remnant of the nictitating membrane (the "third eyelid") which is present in other animals.

The plica semilunaris also secretes rheum, commonly known as sleep: the hardened crust that forms on the eye during sleep.

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