<prompt> Passavants ridge is formed by-Cricopharyngeus and superior constrictorPalatopharyngeus and superior constrictorPalatoglossus and superior constrictorThyropharyngeus and superior constrictor  <response>: Ans. is b i.e., Palatopharyngeus and superior constrictor Passavants Ridgeo Some of the upper fibres of the palatopharyngeus pass circularly deep to the mucous membrane of the pharynx, and form a sphincter internal to the superior constrictor. These fibres constitute Passavants muscle which on contraction raises a ridge called the Passavants ridge on the posterior wall of the nasopharynx. 