Diseases of the nose and its accessory cavities / by W. Spencer Watson ; with special sections ... by Robert Liveing, William Adams and A.E. Cumberbatch.

  • Watson W. Spencer (William Spencer), 1836-1906.
Date:
1890
Catalogue details

Licence: Public Domain Mark

Credit: Diseases of the nose and its accessory cavities / by W. Spencer Watson ; with special sections ... by Robert Liveing, William Adams and A.E. Cumberbatch. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    olfactory region—the olfactory channel, and a lower or respira- tory channel. The mucous membrane covering the middle turbinated bone is prolonged into an elevation anteriorly, described by Meyer as the agger 7iasi. Its direction is almost parallel with the dorsal ridge of the nose, running forwards and downwards, till it reaches very nearly to the anterior aperture of the nostril. This agger nasi approaches very near to a thickened portion of the septum, and a very slight lateral com- pression, as by the action of the compressor naris muscle, brings them into actual contact, and so divides the fossa into the two channels above alluded to. This arrangement will be found to be important in reference to the anosmia associated with facial palsy, and will be referred to in a future page. Besides the anterior openings (the nostrils) by which they communicate with the external air, the nasal fosste have each a posterior opening (the posterior nares), which makes their cavities continuous with that of the pharynx. The furrows or depressions on the outer wall of each fossa formed by the projecting tui-binated bones are termed meatuses. They are three in number—the superior, middle, and inferior. Each fossa communicates with four sinuses, the frontal, above, opening, with the anterior ethmoidal cells, into the middle meatus through the infundibulum; the sphenoidal, behind, opening into the superior meatus; the maxillary or antrum Highmorianum, opening indirectly into the middle meatus at the lower part of the infundibulum (see Giraldes' treatise, Des Cystes Muqueux ) ; and the posterior ethmoidal, opening into the superior meatus (see Figs, under Section on Antrum). Bach fossa also communicates with the conjunctival surface by a continuation of the mucous membrane of the inferior meatus through the nasal duct, lachrymal sac, and the canali- culi and puncta lachrymalia. The Functions and Minute Anatomy of the Nasal Fossce. The nose and its fossas may be regarded in four different aspects—1, as a sense organ; 2, as a part of the respiratory apparatus; 3, as part of the face and of the mechanism of expression; 4, as part of the vocal mechanism. Fii'st, regarded as a sense organ, it must be divided into (o) the olfactory region proper, or that part of the mucous lining of