Plica semilunaris of the fauces
Encyclopedia
The plica semilunaris is the thin upper part of the fold of mucous membrane
Mucous membrane
The mucous membranes are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line cavities that are exposed to the external environment and internal organs...

 in the supratonsillar fossa that reaches across between the two arches. The remainder of the fold is called the plica triangularis.
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