plica semilunaris


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sem·i·lu·nar fold

[TA]
inconsistent curved fold connecting the palatoglossal and palatopharyngeal arches above the supratonsillar fossa; when present, it always contains lymphoid tissue.
Synonym(s): plica semilunaris [TA]

plica semilunaris 

A crescent-shaped fold of conjunctiva located at the inner canthus lateral to the caruncle. It is a vestigial structure that represents the third eyelid or nictitating membrane of lower vertebrates. Syn. plica lunata; semilunar fold.
References in periodicals archive ?
The plica semilunaris and caruncle are also considered to be part of the conjunctiva.
The plica semilunaris is thought to be the remains of a nictitating membrane or third eyelid (from the Latin nictare, meaning blink).
In humans, a vestigial remnant of the nictitating membrane is the plica semilunaris on the inside corner of the eye.