Passavant ridge is formed by-: (A) Tensor veli palatini and superior constrictor, (B) Palatopharyngeous and superior constrictor, (C) Palatopharyngeous and inferior constrictor, (D) Palatoglossus and superior constrictor
Answer is B. 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 Passavant's muscle which on contraction raises a ridge called the Passavant's ridge on the posterior wall of the nasopharynx.