. Diseases of the nose and throat . aso-pharynx, and entering it by the posterior nares, or choanse, as they aresometimes called. These cavities vary very much in size, the averagedepth from before backward in the adult being about 5 centimetres,and the height centimetres in the centre of the fossas. The sum-mit of the vault on each side is only a narrow chink, arching fromthe front to the back; while the floor runs almost horizontally back-ward, with a surface varying between 1 and 11/2 centimetres in external walls of the passages slant irregularly outward anddownward (Fig. 2).
. Diseases of the nose and throat . aso-pharynx, and entering it by the posterior nares, or choanse, as they aresometimes called. These cavities vary very much in size, the averagedepth from before backward in the adult being about 5 centimetres,and the height centimetres in the centre of the fossas. The sum-mit of the vault on each side is only a narrow chink, arching fromthe front to the back; while the floor runs almost horizontally back-ward, with a surface varying between 1 and 11/2 centimetres in external walls of the passages slant irregularly outward anddownward (Fig. 2). (3) 4 DISEASES OF THE NASAL PASSAGES. The septum divides the fossae from each other from front toback. It is formed of the triangular cartilage in front, the perpen-dicular plate of the ethmoid in the upper portion behind, with thevomer immediately beneath it. In early life the septum usually oc-cupies its natural central position; during youth and commencingmaturity it very frequently becomes deflected in some part of its Fig. 1.—Cartilages of the nose, seen in profile (Sappey). 1, Rightlateral cartilage. 2, Its anterior border. 3, An accessory cartilaginousnucleus attached to the inferior border of the same cartilage. 4, Anterioraccessory cartilages remarkable for their ovoidal form and the constancyof their existence. 5, External branch of the alar cartilage. 6, Union ofthis branch with the internal branch. 7, 8, 9, Secondary cartilaginousbranches added to the external branch of the alar cartilage. 10, Accessorycartilage not constantly found. (After Bosworth.) The outer walls of the nasal fossa? are formed from before back-ward by the nasal, the superior maxillary, the lacrymal, the ethmoid,the palate, and the internal pterygoid plate of the sphenoid. At-tached horizontally to this bony wall, arranged from above downward,are three scroll-like bones; the superior, the middle, and the in- ANATOMY OF THE NOSE. ferior turbinateds. The superior turbinated, descending
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