File:Anatomy, physiology and hygiene (1900) (14778972862).jpg

Identifier: anatomyphysiolog00walk (find matches)
Title: Anatomy, physiology and hygiene
Year: 1900 (1900s)
Authors: Walker, Jerome, 1845-
Subjects: Physiology Health
Publisher: Boston, Allyn and Bacon
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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. Itis a part of the natural water of the brain and skullcavity.2 When this fluid in the labyrinth is compressedby the pressure inward of the stirrup, it finds relief atthe round window, by a slight yielding of the membrane.Lining the osseous labyrinth is the membranous labyrinth.Distributed in and upon it are the delicate filaments of 1 If, while a bathers head is immersed, two stones or shells bo clashedtogether under the water, the sounds perceived by him will be almostdeafening, and may permanently impair his hearing. Children should beextremely careful not to play this dangerous trick upon one another. 2 A fluid between the membrane of the labyrinth and its bony encase-ment is called the perilymph. 358 HEARING. the auditory nerve. Of this nerve there are two mainbranches, — the cochlear branch, supplying the cochlea,and the vestibular branch, supplying the remaining por-tion of the membranous labyrinth. The filaments of thecochlear nerve are distributed in a very complex manner
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Fig. 111.(From photograph by Etdingek.) A. Eight temporal bone, auricle and external canal removed. —MT, membrana tympani, or drum-head ; M, handle of malleus showing through. B. Eight temporal bone, inner side, petrous portion removed. —MT, the drum-head ; OS, chain of bones in position. C. The bones of the ear. —1, the malleus : 2, the incus ; 3, the stapes. D. The relation of the bones of the ear to the bony portion of the internal ear. —1, the ossi- cles, foot-rest of stapes, attached to oval window; 2, the cochlea ; 3, the semicircularcanals; -i, the upper end of Eustachian tube. The round window is not seen in thecut. to the shelves of the cochlea, and end upon thousands oflittle hair-like cells, harp strings as it were, which areheld in place upon the so-called a?ches of Corti.1 Thevibration of these hair-like cells is communicated to their 1 There are said to be about three thousand arches of Corti in thehuman ear, each one tuned to respond to the various musical sound

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