Identifier: americantextbook00howe (find matches)
Title: An American text-book of physiology
Year: 1897 (1890s)
Authors: Howell, William H. (William Henry), 1860-1945 Bowditch, H. P. (Henry Pickering), 1840-1911
Subjects: Physiology
Publisher: Philadelphia : Saunders
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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sing through the base of the resting stapes; y, point of passageof the vertical line which represents the axis of rotation of the stapes. Fig. 3.—The three parts making up the bony cochlea (schematic, from Ttstut): A. the columella; B,spiral tube containing the scalae; C, lamina spiralis; J>. the three parts in their normal relations. Fig. 4.—Schematic representation of the perilymphatic and endolymphatic sfiaces. The formerapfjear in black, and the latter are colored blue (Testut i: 1, utricle ; 2, saccule ; 3, semicircular canal; 4,caualis cochlearis ; 5, ductus endolymphaticus with its two branches of origin ; 6, saccus endolymph-aticus ; 7, canalis reuniens, or canal of Ilensen ; 8, scala tympani; 9, scala vestibuli; 10, their communi-cation at the helieotrema ; 11, aqua-ductus vestibuli ; 12, aqua^ductus cochlearis : 13, periosteum; 14, duramater; 15, stapes in the fenestra ovalis; 16, fenestra rotunda with its membrane. 77//; s/:.\s/: or uearing. ILATK ± Fif!. 1. Fig. 2.
Text Appearing After Image:
THE SENSE OF HEARING. 817 soon learn to know as the .sm/a vesfibull, and the lower chamber as the scalatympani (Fig. 277; PI. 2, Fig. 3). The bony shelf mentioned above as partlybisecting the cochlear tube has, of course, like the latter, a spiral course, and isknown as the lamina spiralis; its importance as a supporter of the auditory-nerve filaments will soon be seen. Contained within the cavity of the bony labyrinth, and parallel with its walls,is the manhranom labijrinth, in which are found the essential structures of theorgan of hearing (PI. 2, Fig. 4 ; Fig. 278). The membranous labyrinth is filledwith a somewhat watery, mucin-holding fluid, the endolymph, while a similarfluid, the perilymph, is found outside it and within the osseous labyrinth. Theperilymph space, which is lined by lymphafic epithelium, is in communication,along the sheath of the auditory nerve, with the subdural and subarachnoidlymph-areas of the brain. Numerous sheets and bars of connective tissue crossfrom th

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