sphincter of the pharyngeal isthmus -->
palatopharyngeal sphincter
medical dictionary

<anatomy> A constant band of the superior pharyngeal constrictor muscle which sweeps posteriorly from the anterolateral part of the superior surface of the palatine aponeurosis. It creates a visible ridge when the superior constrictor is contracted, meeting the elevated soft palate to seal off the pharyngeal isthmus during swallowing.

Synonyms: pharyngeal ridge, sphincter of the pharyngeal isthmus, velopharyngeal sphincter.

(05 Mar 2000)