. The anatomy of the human body. Human anatomy; Anatomy. 680 described and figured by Scemmering. M. Breschet has recently enriched onr knowl- edge of this intricate anatomical subject with many most interesting facts. {Etudes anatomiques et physiohgiques sur Vorgane de I'ouie et sur Vaudition dans I'homme et les ani- maux vertcbres, 1833.) It is useless to attempt the examination of the membranous labyrinth in the human subject without some previous preparation. If the labyrinth be opened, it is found to contain a fluid; the eye can detect nothing else. By previously macerating it
. The anatomy of the human body. Human anatomy; Anatomy. 680 described and figured by Scemmering. M. Breschet has recently enriched onr knowl- edge of this intricate anatomical subject with many most interesting facts. {Etudes anatomiques et physiohgiques sur Vorgane de I'ouie et sur Vaudition dans I'homme et les ani- maux vertcbres, 1833.) It is useless to attempt the examination of the membranous labyrinth in the human subject without some previous preparation. If the labyrinth be opened, it is found to contain a fluid; the eye can detect nothing else. By previously macerating it in diluted nitric acid, the twofold advantage is gained of softening the bones, so that they can be cut with a scalpel, and of hardening and rendering opaque the nervous tissues. Before studying the membranous labjTinth in the human subject, it should first be examined in the large cartilaginous fishes, such as the ray and the turbot, in which it is most highly developed. It is then seen that the semicircular canals and the vestibule contain, be- sides a fluid, certain semi-trarisparent membranous tubes and sacs, the aspect of which closely resembles that of the retina. The membranous labyrinth {fig. 265) is not so extensive as the osseous labyrinth: thus, it does not enter the cochlea, and its diameter is much less than that of the bony labyrinth. It scarcely occupies one half the cavity of the latter. The space between the bony and membranous lab- yrinths is filled with a limpid fluid, named, after Co- tugno, the liquor Cotunnii, although it had been no- ticed by several anatomists before that author. (De f~y aqucE ductiius auris humancE interna. Cotugno, 1760.) It is the perilymph of M. Breschet. There is no air in the labyrinth, and it is somewhat MembraLous ubyrinth (lefiside). slugular that SO accuratic an anatomist as M. Ribes should have recently defended a contrary opinion, although it has been repeatedly refuted. The membranous labjTinth is itself filled with a fluid
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
