oropharyngeal isthmus

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isth·mus of fau·ces

the constricted and short space that establishes the connection between the cavity of the mouth and the oropharynx, bounded anteriorly by the palatoglossal folds and posteriorly by the palatopharyngeal folds; the lateral well is the tonsillar fossa.
Farlex Partner Medical Dictionary © Farlex 2012
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On physical examination, the patient had a smooth-surface, polypoid, pedunculated tumoral lesion originating from the middle pole of the left palatine tonsil and protruding into the oropharyngeal isthmus. The patient underwent left tonsillectomy.
The palate controls the two gates the pharyngeal isthmus and the oropharyngeal isthmus. It can be completely close them or can regulate their size according to requirements.