Tonsillar fossa

Tonsillar fossa

The mouth cavity. (Tonsillar fossa, which is a part of the oropharynx, visible but not labeled.)
Latin fossa tonsillaris
TA A05.2.01.009
FMA 55041

Anatomical terminology

The tonsillar fossa (or tonsillar sinus) is a space delineated by the triangular fold (plica triangularis) of the palatoglossal and palatopharyngeal arches within the lateral wall of the oral cavity.[1] In this space lie the palatine tonsils .

In many cases, however, this sinus is obliterated by its walls becoming adherent to the palatine tonsils.


  1. "tonsillar fossa". Retrieved 2016-11-05.

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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