<prompt> Passavant ridge is formed by:Tensor veli palati and superior constrictorPalatopharyngeus and superior constrictorPalatopharyngeus and inferior constrictorPalatoglossus and superior constrictor  <response>: Some fibres of the palatopharyngeus muscle arising from palatine aponeurosis sweep horizontally backwards and join the upper fibres of the superior constrictor muscle to form a U-shaped muscle-loop in the posterior pharyngeal wall underneath the mucosa, which is pulled forward during swallowing to form the Passavant ridge. 