Often called a third eyelid or haw, it may be referred to in scientific terminology as the "plicasemilunaris", "membrana nictitans" or "palpebra tertia".
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The duct empties into the nasal cavity middle nasal meatus through the infundibulum of the hiatussemilunaris.
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With ocular allergies, the lacrimal caruncle and plicasemilunarismay be inflamed and pruritic (itchy) due to histamine release in the tissue and tear film.
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These occur throughout the conjunctiva, especially the plicasemilunaris.
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