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|The mouth cavity. (Tonsillar fossa, which is a part of the mesopharynx, visible but not labeled.)|
|Gray's||subject #243 1138|
Between the plica triangularis and the surface of the palatine tonsils is a space known as the tonsillar fossa (or tonsillar sinus); in many cases, however, this sinus is obliterated by its walls becoming adherent.
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