Passavant ridge is seen in?
Nasopharyngeal Isthmus: Fibres of palatopharyngeus muscle (arising from palatine aponeurosis) +upper fibres of superior constrictor muscle form incomplete raised ring at posterior & lateral pharyngeal wall known as = Passavant ridge.
Oropharynx
Nasopharynx
Laryngopharynx
Lateral nasal wall