Identifier: educationofdeafm00thom (find matches)
Title: Education of Deaf-Mutes : A Manual for Teachers
Year: 1888 (1880s)
Authors: Thomas Arnold
Subjects: Education
Publisher: Wertheimer, Lea & Co.
Contributing Library: American Printing House for the Blind, Inc., M. C. Migel Library
Digitizing Sponsor: American Printing House for the Blind, Inc.

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which isof the plain variety, forms a flat band, the fibres of whichrun transversely at the back of the tube. The trachea islined by a mucous membrane, which has a ciliatedepithelium upon its inner surface. The two divisions of the trachea, the bronchi (Fig. 1,h), are precisely similar in structure. And the larynxis also very like the trachea, so far as the structure of themucous membrane is concerned, but over the true vocalchords and upon the epiglottis (Fig. 1, e), as well as here Fig. 2. —Semi-diagrammatic view of the Thorax, to show thePosition of the Lungs with respect to the Ribs, etc. (One-fourth natural size). Tlae lungs have shrunk from the front of the chest;a, right clavicle; w, placed on the lower part of the manubrium of thesternum ; g, the right lung ; t, the heart; /, /, the diaphragm, separatingthe cavity of the thorax from that of the abdomen; h, right, h, left lobeof the liver; 1-10, placed on the 1st, 2nd, etc., ribs, just beyond the end ofthe costal cartilages.
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i OF DEAF-MUTES. 165 and there in the part above the glottis, Btratified epitheliumand taste-buds may occur, except over the vocal chords. (S.) The bronchial tubes at first consist of two mainbranches (Fig. 1, h, b), afterwards they ramify still moreand terminate in air cells. 50. The Lungs (Fig. 2) are formed of an infinite numberof these cells, separated from one another by a thin tissuefilled with bloodvessels. They are charged and emptied ofair by an alternative movement of expansion and contrac-tion. In their expansion, or inspirative action, theexternal air is drawn in through the windpipe and bronchialtubes; and by their contraction or expirative action thisair is driven out by the same route. In a healthy state thisdouble movement is made with great regularity, at the rate ofeighteen double respirations per minute in adults, which are3^ seconds for both. The second movement is a little longerthan the first, for it is followed by a short pause. But inspecial circumstances, as i

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