The Palatine Tonsils: It sits in an alcove between the anterior (palatoglossal) and posterior (palatopharyngeal) arches,
or pillars, and frequently exhibit surface pits or depressions called crypts.
Posterior oral cavity/oropharynx. The anterior pillar (palatoglossal arch) marks the posterior boundary of the oral cavity proper. The palatine tonsils, which are located in the tonsillar fossae, are not visible in this photo. Asterisk marks posterior oropharyngeal wall.
Oropharynx showing large palatine tonsils with prominent crypts. Note debris visible within crypts on the left (short arrows) as well as a papilloma at the left base of uvula (long arrow)