Identifier: textbookofnorma00pier (find matches)
Title: Textbook of normal histology: including an account of the development of the tissues and of the organs
Year: 1897 (1890s)
Authors: Piersol, George A. (George Arthur)
Subjects: Histology
Publisher: Philadelphia, J. B. Lippincott
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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es of the auditory nerve pass into the septum trans-versum, where they unite into net-works from which finer divergingfibrillae pass into the overlying epithelium after losing their medul-lary substance. Small groups of naked axis-cylinders extend be-tween the epithelial cells and separate into the individual fibrillae,some of which are applied to the bases of the hair-cells, while othersapparently seek their ultimate distribution at higher levels. The blood-vessels supplying the semicircular canals comprisethose destined for the bony capsule and those distributed to the ,gg NORMAL HISTOLOGY. membranous structures. These vessels form a wide-meshedcapillary net-work within the fibrous tunic of the canals and theampullae, which supplies both the endo- and perilymphatic surfaces. THE COCHLEA. The cochlea consists of the tapering bony tube wound spirallyabout its axis and containing the highly-specialized but muchsmaller epithelial canal, the ductus cochlearis. This latter tube, Fig. 400.
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Longitudinal section of cochlea of guinea-pig: a, bony capsule; b, central shaftor modiolus ; c, lamina spiralis ; d, canal of modiolus containing bundles of nerve-fibres (e); /, terminal bundles ; g, basilar membrane ; h, spiral ligament ; 1, limbus ;j, membrane of Reissner ; /, Cortis organ ; m, spiral ganglion ; n, blood-vessels ; V,T, M, respectively scala vestibuli, tympani, and media. triangular in transverse section, is attached along its base to the outerwall of the bony tube, and along its narrow opposite border to theprojecting osseous spiral lamina; in consequence of this arrange- THE ORGAN OF HEARING. ,30 ment the perilymphatic space, instead of constituting a singlecavity in which the epithelial tube is suspended, is divided into thescala vestibuli above and the scala tympani below, which com-municate respectively with the vestibule and the tympanum. The ductus cochlearis, or scala media, consists, like other por-tions of the membranous labyrinth, of the epithelial tube,

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