A text-book on diseases of the ear, nose and throat . recessus pharyngeus,or fossa of Eosenmiiller. Anterior to the fossa of Eosenmiiller the ANATOMY AND PHYSIOLOGY OF THE NOSE AND NASOPHARYNX. 243 Eustachian tube can be seen jutting from the lateral i^haryngeal direction of its canal is downward, forward, and inward. It mayopen in the shape of a funnel or as a narrow triangular slit. The ex-tremity of the Eustachian tube is removed from the posterior end of theinferior turbinal bj about one-fourth of an inch. When the soft palate israised it closes the nasopharynx below and forms its
A text-book on diseases of the ear, nose and throat . recessus pharyngeus,or fossa of Eosenmiiller. Anterior to the fossa of Eosenmiiller the ANATOMY AND PHYSIOLOGY OF THE NOSE AND NASOPHARYNX. 243 Eustachian tube can be seen jutting from the lateral i^haryngeal direction of its canal is downward, forward, and inward. It mayopen in the shape of a funnel or as a narrow triangular slit. The ex-tremity of the Eustachian tube is removed from the posterior end of theinferior turbinal bj about one-fourth of an inch. When the soft palate israised it closes the nasopharynx below and forms its floor. The anteriorboundary of the nasopharynx is formed by the posterior nares. Histology of the Xaso])liarynx.—Ciliated eijithelium in a single or inseveral layers lines the interior of the nasopharynx and back of thevelum i:)alati. On the posterior wall ciliated epithelium extends in chil-dren as far down as the level of the soft i:)alate ; in adults only down tothe level of the upper border of the superior constrictor of the pharynx. Fig. 3 4 Transverse section of the pharyngeal tonsil of a one-year-old child. (Heymann.) 1, epithelium;2, propria; 3, glands ; 4, basilar fibrocartilage. Below this the ciliated epithelium merges into pavement the epithelium there i-s a basement membrane and, as far as theciliated epithelium extends, no pai^illa?. The pharj^ngeal mucous mem-brane contains many elastic fibres and mucous glands which are especiallynumerous on the pharyngeal vault. The minute anatomy of Luschkas tonsil requires especial is simply a thick mucous membrane of the same structure as thatfound elsewhere in the nose and nasopharynx, with the lymphoid elementso pronounced as to overshadow the other elements. There is. there-fore, no essential difference between the structure of the third tonsil andthat of the rest of the nasal and nasopharyngeal mucous membrane, sothat it can readily be understood why adenoid vegetations are often f
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