Which conjunctival fold is the transition between the medial canthus caruncle and medial conjunctiva?

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Multiple Choice

Which conjunctival fold is the transition between the medial canthus caruncle and medial conjunctiva?

The semilunar fold, also known as the plica semilunaris, is the crescent-shaped fold of conjunctiva at the inner corner of the eye. It sits at the medial canthus and marks the boundary between the lacrimal caruncle and the medial conjunctiva. This small fold is a vestigial remnant of the nictitating membrane in humans, serving mainly as a boundary and a flexible fold as the eyelids move. The other structures don’t fit this location or function: the puncta are tiny openings for tear drainage on the eyelids, pterygium is a fibrous growth extending onto the cornea, and pseudoguttae are not the transitional conjunctival fold at the medial canthus.

The semilunar fold, also known as the plica semilunaris, is the crescent-shaped fold of conjunctiva at the inner corner of the eye. It sits at the medial canthus and marks the boundary between the lacrimal caruncle and the medial conjunctiva. This small fold is a vestigial remnant of the nictitating membrane in humans, serving mainly as a boundary and a flexible fold as the eyelids move.

The other structures don’t fit this location or function: the puncta are tiny openings for tear drainage on the eyelids, pterygium is a fibrous growth extending onto the cornea, and pseudoguttae are not the transitional conjunctival fold at the medial canthus.

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