velopharyngeal sphincter --> 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)