Question

what is plica semilunaris and what is its location and function

Answer 1

The plica semilunaris is a small fold of bulbar conjunctiva on the medial canthus of the eye

It functions during movement of the eye, to help maintain tear drainage via the lacrimal lake, and to permit greater rotation of the globe, for without the plica the conjunctiva would attach directly to the eyeball, restricting movement.