File:The eclectic guide to health; or, Physiology and hygiene (1887) (14803997913).jpg

Identifier: eclecticguidetoh00brow (find matches)
Title: The eclectic guide to health; or, Physiology and hygiene ..
Year: 1887 (1880s)
Authors: (Brown, Eli F.) (from old catalog)
Subjects: Physiology Hygiene
Publisher: Cincinnati, New York, Van Antwerp, Bragg & co
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
rmed of thin cartilage, coveredwith skin. It catches the sound, and directs it toward theinner parts of the ear. The canal leading from the conchais an opening through the petrous bone, lined with skin. It-is about one fourth of an inch in diameter, and an inchlong. It is an air chamber, and conducts the sound towardthe inner ear. The inner end of this canal is closed by amembrane, which is stretched tightly across it. This canalis called the external auditory canal. The middle portion of the ear is called the tympanum.It is an air chamber in the petrous bone, about as large asa small cherry. Its outer wall is formed by the thin mem-(142) HEARING. J43 brane across the end of the external canal. This is calledthe external membrane of the tympanum. Sometimes it iscalled the outer drum of the ear. There are other, smallermembranes, on the side of the tympanum, next to the innerear, which separates the middle from the inner portion ofthe ear. The outer membrane of the tympanum, and one of
Text Appearing After Image:
DiAGr.AMATic Section op Left Ear.—1. Concha. 2. External canal. 3. Middle car, crossed bythe ossicles. 4. Inner ear. 5. Petrous bone. 6. External membrane of the middle car. 7. Eustachiantube. 8. Auditory nerve. the inner membranes are joined by a very crooked line oftiny bones, called the ossicles of the ear.1 A small air tube,called the eustachian tube, or internal auditory canal, leadsfrom the tympanum to the pharynx, so that the air may passin or out of the tympanum. The tympanum is to convey thesound from the outer to the inner ear. The inner ear is a very singularly-shaped chamber in thepetrous bone. This chamber is filled with a watery fluid, 144 PHYSIOLOGY. and has in it the membranes on which the nerves of hearingare spread out. It is the most important part of the ear.The other portions may be destroyed, and yet the personcan hear quite well by this portion alone. This inner earconsists of several parts, which seem designed for differentpurposes in hearing.2 145. How We He

Note About Images