<prompt> Passavant ridge is formed by-Tensor veli palatini and superior constrictorPalatopharyngeous and superior constrictorPalatopharyngeous and inferior constrictorPalatoglossus and superior constrictor  <response>: 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. 