File:Anatomy, physiology and hygiene (1900) (14592657709).jpg

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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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the most varioussounds. No musical instrument has ever been constructed by man thatapproaches in perfection or effectiveness that of the human voice. —Dr. Louis Elsbeeg. The TTiroat and its Functions. THE VOICE. 367 AC ences of sound which make up the human voice. Some ofthe muscles of the larynx move and rotate the arytenoidsoutwardly, thus separating the vocal cords and wideningthe chink of the glottis.Others move and rotatethe arytenoids inwardly,thus approximating thevocal cords, and, in avarying degree, closingthe glottis. The remain-ing muscles of the larynxserve to regulate the ten-sion of the cords, or areconcerned in respiration,or act upon the epiglottisduring the act of swallow-ing. The nerves whichsupply the mucous mem-brane of the larynx withsensibility and the mus-cles with motor powerare four in number. 397. Mechanism of theProduction of Voice. — Be-fore the introduction anduse of the laryngoscope,1there was much uncer-tainty as to the mechan-ism for the product ion
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Fig. 1 12.Posterior View of Larynx. T, base of tongue. Til, upper part of thyroid cartilage (the epiglot-tis is seen between the upper portions of thiscartilage and behind the tongue). CO, the cricoid cartilage. AC, arytenoid cartilages, hid in part by muscles.Til, trachea. 1 and 2, nerves of larynx, branches distributedto the tongue, to the epiglottis and the foldsof membrane between the epiglottis and ary-tenoids, and to muscles controlling the actionof the cricoid ami arytenoid cartilages. 1 An oval or round mirror attached to ;i long handle, which, placed inthe back and upper pari of the throat, reflects the interior oi the Larynx, and, under favorable conditions, a part of the trachea. This instrument 368 THE VOICE. of voice. An examination of the interior of the larynxwith this instrument during ordinary respiration showsthe chink of the glottis to be quite wide during in-spiration, but much narrowerduring expiration; for in thelatter case the muscles of thelarynx are passive, a

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  • bookid:anatomyphysiolog00walk
  • bookyear:1900
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Walker__Jerome__1845_
  • booksubject:Physiology
  • booksubject:Health
  • bookpublisher:Boston__Allyn_and_Bacon
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:378
  • bookcollection:library_of_congress
  • bookcollection:americana
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29 July 2014

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