<prompt> Passavants ridge is formed bySuperior constrictor and palatopharyngeusInferior constrictor and palatopharyngeusSuperior constrictor and palatoglossusInferior constrictor and palatoglossus  <response>: It is a mucosal ridge raised by fibres of palatopharyngeus. It encircles the posterior and lateral walls of the nasopharyngeal isthmus.Soft palate, during its contraction, makes firm contact with this ridge to cut off nasopharynx from the oropharynx during the deglutition or speech. 