. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. m our attention. 402. It will be remembered that the windpipe is surmounted by a stoutbony annulus, termed the Cricoid cartilage, which serves as a foundation forthe superjacent mechanism. This is embraced (as it were) by the Thyroid,which is articulated to its sides by its lower horns, round the extremitiesof which it may be regarded as turning, as on a pivot. In this manner thelower front border of the thyroid cartilage, which is ordinar
. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. m our attention. 402. It will be remembered that the windpipe is surmounted by a stoutbony annulus, termed the Cricoid cartilage, which serves as a foundation forthe superjacent mechanism. This is embraced (as it were) by the Thyroid,which is articulated to its sides by its lower horns, round the extremitiesof which it may be regarded as turning, as on a pivot. In this manner thelower front border of the thyroid cartilage, which is ordinarily separated bysmall intervals from the upper margin of the thyroid, may be made to ap-proach it or recede from it; as any one may easily ascertain, by placing hisfinger against the little depression which may be readily felt externally, andobserving its changes of size, whilst a range of different tones is sounded; itwill then be observed that, the higher the note, the more the two cartilagesare made to approximate,—whilst they separate in proportion to the depthof the tones.* Upon the upper surface of the back of the cricoid are seated Fisr. External and sectional views of the Larynx, after Willis, a n b, the cricoid cartilage; bcc, thethyroid cartilase; g, its upper horn; c, its lower horn, where it is articulated with the cricoid.; f, thearytenoid cartilase; e, p, the vocal lisament; a k, crico-thyroideus muscle; f e m, thyro-aryienoideusmuscle; x e,crico-arytenoideus lateralis: s, transverse section of arytenoideus transversus; m n, spacebetween thyroid and cricoid; b l, projection of axis of articulation of arytenoid with thyroid. * In making this observation, it is necessary to put out of view (he general move-ment of the larynx itself, which the finger must be made to follow up and down. OF THE VOICE AND SPEECH. 291 Fie. 37. the two small Arytenoid cartilages; these are fixed in one direction by abundle of strong ligaments, which tie them to the back of the cric
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Keywords: ., bookcentury1800, bookdecade1840, bookpubli, booksubjectphysiology
