Quain's elements of anatomy . aryn-geal cavity, the superior vocalcords {cvs, fig. 453) being furtherapart than the inferior or true vocal cords, the structures by the vibration ofwhich the sounds of the voice are j)roduced, bound the two anteriorthirds of the aperture of the glottis, corresponding with the thyro-aryte-noid ligaments (fig, 454, c). The mucous membrane covering them isso thin and closely adherent as to show the yellowish colour of the liga-ments through it. Their free edges, which are sharp and straight, anddirected upwards, form the lower boundaries of the ventric
Quain's elements of anatomy . aryn-geal cavity, the superior vocalcords {cvs, fig. 453) being furtherapart than the inferior or true vocal cords, the structures by the vibration ofwhich the sounds of the voice are j)roduced, bound the two anteriorthirds of the aperture of the glottis, corresponding with the thyro-aryte-noid ligaments (fig, 454, c). The mucous membrane covering them isso thin and closely adherent as to show the yellowish colour of the liga-ments through it. Their free edges, which are sharp and straight, anddirected upwards, form the lower boundaries of the ventricles, and arethe parts throvm into vibration diuing the production of the inner surfaces are flattened, and look towards each other. The rima glottidisj, an elongated aperture, situated, anteriorly,between the inferior or true vocal cords, and, posteriorly, between thebases of the arytenoid cartilages, forms a long narrow slit, slightly widerin the centre when nearly closed, as in the production of the voice ; when. MUSCLES OF THE LAEYJSTX. 531 moderately open, as in easy respiration, its shape is that of a long triangle,the pointed extremity being directed forwards, and the base beingbehind, between the arytenoid cartilages (fig. 453, b) ; in its fhlly dilatedcondition it is lozenge-shaped (the posterior sides being formed by theinner sides of the bases of the arytenoid cartilages), while the posteriorangle is truncated (c). The rima glottidis is the narrowest part of theinterior of the larynx ; in the adult male it measures about 23 mm.,or nearly an inch, in an antero-posterior direction, and 6 or 8 at its widest part, which may be dilated to nearly 12 mm. Inthe female, and in males before the age of puberty, its dimensions are less,its antero-posterior diameter being about 17 mm., and its transverse dia-meter about 4 mm. The vocal cords are about 15 mm. long in the adultmale, and 11 mm. in the female. The ventricles or sinuses of the larynx (fig. 452, s,
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
