File:Carpenter's principles of human physiology (1881) (14595182047).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Text Appearing Before Image:
ilage; s, epiglottis; v, glottis;easilv ascertain *> posterior opening of nares; 3, isthmus faucium; 4, superior opening of larynx;n ■, 5, passage into oesophagus; 6, mouth of right Eustachian tube. by placing his finger against the little depression which may be readily felt externally, and ob-serving its changes of size, whilst a range of different tones is sounded; for it willthen be noticed that, the higher the note, the more the two cartilages aremade to approximate, whilst they separate in proportion to the depth of thetones.* Upon the upper surface of the back of the Cricoid, are seated thetwo small Arytenoid cartilages (Figs. 301, 302, F f) ; these are fixed in onedirection by a bundle of strong ligaments, which tie them to the back of thecricoid; but they have some power of moving in other directions, upon a Kind * In making this observation, it is necessary to put out of view the general movement ofthe Larynx itself, which the finger must be made to follow up and clown.
Text Appearing After Image:
828 OF THE VOICE AND SPEECH. of articulating suface. The direction of the surface, and the mode in whichthese cartilages are otherwise attached, cause their movement to be a sort ofrotation in a plane which is nearly horizontal, but partly downwards ; so thattheir vertical planes may be made to separate from each other, and at the sametime to assume a slanting position. This change of place will be better under-stood when the action of the muscles is described. To the lower part of theanterior surface of the Arytenoid cartilages are attached the chordce vocalesor Vocal Ligaments (Fig. 300, e f, Fig. 302, t v), which stretch across to thefront of the Thyroid cartilage; and it is upon the condition and relativesituation of these ligaments that their action depends. It is evident that theymay be rendered more or less tense by the movement of the Thyroid cartilage Fig. 300 Fig. 301.

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