Nasopharyngeal stricture

Nasopharynx (nasopharynx) refers to the part above the plane of the sail, through the nasal cavity forward through the nostril. Directly behind the side of the inferior turbinate, a phary-ngeal opening of auditory tube passes through the middle ear drum. There are curved bulges before, above, and behind the eustachian tube of the eustachian tube, which are called tubal torus. The longitudinal deep fossa between the back of the Eustachian tube pillow and the posterior pharyngeal wall, called the pharyngeal recess, is a common site for nasopharyngeal cancer. There is abundant lymphoid tissue in the mucosa of the upper wall of the nasopharynx, called pharyngeal tonsil, which is more developed in early childhood. After 6 to 7 years of age, it begins to shrink and almost completely degenerate after 10 years of age.