Passavants ridge is formed by ?

Ans. is 'd' i.e., Palatopharyngeus Pharynx has two group of muscles :? Intrinsic muscles :- Stylopharyngeous, salpingopharyngeous, palatopharyngeous. Extrinsic muscles :- Superior constrictor, middle constrictor, inferior constrictor. All muscles of pharynx are supplied by cranial accessory through branches of vagus pharyngeal plexus except stylopharyngeus which is supplied by glossopharyngeal. Inferior constrictor muscle has two pas :- (i) Thyropharyngeous with oblique fibres, and (ii) Cricophatyngeous with transverse fibres. Between these two pas of inferior constrictor exists a potential gap called Killan's dehiscence. It is also called the gateway to tear as perforation can occur at this site during esophagoscopy. It is also the site for herniation of pharyngeal mucosa in case of pharyngeal pouch. Upper fibers of palatopharyngeus constitute the Passavant's muscle which on contraction raises a ridge called Passavant's ridge on posterior wall of nasopharynx.