Politzer's text-book of the diseases of the ear and adjacent organs : for students and practitioners / translated by Oscar Dodd ; edited by Sir William Dalby.

  • Politzer, Adam, 1835-1920.
Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: Politzer's text-book of the diseases of the ear and adjacent organs : for students and practitioners / translated by Oscar Dodd ; edited by Sir William Dalby. Source: Wellcome Collection.

    600/760 (page 584)
    DISEASES OF THE SOÜND-PEECEIYING APPAEATUS (DISEASES OF THE INNER, EAR). I.—ANATOMY OF THE INNEK EAE. The inner ear or sound-perceiving apparatus comprises the central origin of the auditory nerve, the trunk of the auditory nerve, and its expansion in the labyrinth. According to the customary anatomical representation we begin with the description of the labyrinth. A. The Labyeinth consists of the osseous capsule and the membranous labyrinth enclosed by it. 1. The Osseous Labyrinth is divided into the vestibule, the three semicircular canals, and the cochlea, to which may be added the internal auditory meatus. a. The Vestibule forms an irregular, elliptical cavity, its vertical measure is 5 to 6 mm., transverse 3 to 4 mm., and its height 4 to 5 mm. Its walls d f c d' a eh Fig. 291.—Horizontal Section through the Petrous Bone of a New-born Child. (Twice the actual size.) a, Vestibule ; 6, Base of the cochlea ; c, Cupola of the cochlea ; d, d', Sections of the superior semicircular canal ; e, Internal auditory meatus ; f, Stapes ; g, Antrum mastoideum. merge into each other without any well-defined demarcation. Its lateral wall, chiefly directed downwards, is formed in great part by the fenestra ovalis