. Diseases of the nose and throat . nfantile type; B, Normal adult profile; C, A large nose. THE NASAL VESTIBULESThe nasal vestibules lie between the alae nasi and theseptum, their lower margins forming the nostrils. Pos-teriorly they open into the nasal cavities. Their innersurfaces are supported by the septal cartilage and theirouter by the upper and lower lateral and a few sesamoidcartilages. These cartilages are subcutaneous to the alaeand give the stiffness necessary to hold the vestibules small muscles move the alae and change thesize and shape of the nostrils. The cavity o
. Diseases of the nose and throat . nfantile type; B, Normal adult profile; C, A large nose. THE NASAL VESTIBULESThe nasal vestibules lie between the alae nasi and theseptum, their lower margins forming the nostrils. Pos-teriorly they open into the nasal cavities. Their innersurfaces are supported by the septal cartilage and theirouter by the upper and lower lateral and a few sesamoidcartilages. These cartilages are subcutaneous to the alaeand give the stiffness necessary to hold the vestibules small muscles move the alae and change thesize and shape of the nostrils. The cavity of the vestibule 38 DISEASES OF THE NOSE AND THROAT is divided into an upper and lower portion by the plicavestibuli, formed by the lower margin of the upper lateralcartilage. The upper part is lined with mucous membrane,the lower with skin. From the latter project several thickhairs, the vibrissas, the follicles of which are deeply im-bedded. This portion of the vestibule is subject to thosediseases which affect the skin Fig. io.—Frame of the nasal vestibules. A, Alar cartilage;S, Sesamoid cartilages; C, Septal cartilage; V, Vestibule; N, Nasalspine. THE NASAL SEPTUM The nasal septum is a plate formed by the vomer, theperpendicular plate of the ethmoid, and the triangular orquadrangular septal cartilage. It is attached above to theethmoid, below to the maxillae and palate bones, anteriorlyto the frontal and nasal bones, and posteriorly to thesphenoid. The lower anterior angle has no bony attach-ment. The lower posterior edge formed by the vomer isfree, separating the choanae. Between the vomer and theperpendicular plate of the ethmoid, a prolongation of thecartilage called the caudal extension, often runs a greater or ANATOMY AND PHYSIOLOGY OF THE NOSE 39 less distance along the suture. The vomer is supportedby the nasal crest of the maxillae. Its anterior angle fitsinto the nasal spine in the region in which are fused togetherthe prevomal bones and the premaxilla
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectnose, bookyear1915
