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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mplete the structure Fig. 9.—PoSTERioE Muscles of the Laeynx. h, placed on theinterior of the left ala of the thyroid; <?, the middle of the back of thecricoid; the two larger muscles running obliquely upwards and outwardsfrom c are the posterior crico-arytenoid muscles; they are attached to thelower part of the arytenoids below /, /, but the attachment is not clearlyshown in the figure; ?, /, arytenoid cartilages ; between them lies thetransverse arytenoid muscle; the oblique fibres crossing one another passround the arytenoids to join the thyro-arytenoid and to form the aryteno-epiglottidean muscles. Fijg. 10.—Side View op the Inteeior of the Laeynx. (The rightala of the thyroid is cut away, to show the muscles next to the rima orslit of the glottis.) a, upper horn of the thyroid ; inner surface of itsleft ala; c, cricoid; fZ, right posterior crico-arytenoid muscle; f, rightarytenoid cartilage ; /, part of the arytenoid muscle ; g, thyro-arytenoid ;h, lateral crico-arytenoid.
Text Appearing After Image:
10. OF DEAF-MUTES. 177 externally. Its strength, compactness, and elasticity areeminently adapted to its special uses. 65. Muscles of the Glottis.—Voice is produced, as ina musical instrument, by air on approximated lips or chords,and provision is made for the action by muscles so situatedas to close, open, lengthen, or contract them, as the pitch andmtensity of the sound may require. This is done by muscleshaving different attachments and functions. Beginning with the Crico-thyroid muscle (Fig. 8, g)^it is seen to be a short triangular muscle in the front of the-^larynx. Below, it is attached to the cricoid cartilage and ex-tends from the median line a considerable way backwards ;and its fibres, passing upwards and outwards, divergingslightly, are fixed above to the inferior border of the thyroidcartilage, and to the anterior border of the lower horn. Byanterior contraction it draws closer the cricoid and thyroidcartilages, the thyroid being fixed and the cricoidmoving on the crico

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