. Quain's elements of anatomy . aryteno-epiglottidean muscles, with which theyare closely associated both in the disposition of their fibres and in theiraction. The arytenoid muscle (fig. 456, 2) passes straight acrossbetween the arytenoid cartilages, and its fibres are attached to the wholeextent of the concave surface on the back of each. The aryteno-epiglottidean muscles (fig. 456, 5 ; fig. 458, ) arising nearthe inferior and outer angles of the arytenoid cartilages, decussateone with the other, and their fibres are partly attached to the upperand outer part of the opposite cartilage
. Quain's elements of anatomy . aryteno-epiglottidean muscles, with which theyare closely associated both in the disposition of their fibres and in theiraction. The arytenoid muscle (fig. 456, 2) passes straight acrossbetween the arytenoid cartilages, and its fibres are attached to the wholeextent of the concave surface on the back of each. The aryteno-epiglottidean muscles (fig. 456, 5 ; fig. 458, ) arising nearthe inferior and outer angles of the arytenoid cartilages, decussateone with the other, and their fibres are partly attached to the upperand outer part of the opposite cartilage, partly pass forwards in thearyteno-epigiottic fold, and partly join the fibres of the thyro-arytenoidmuscle. Action.—The arytenoid muscle draws the arytenoid cartilages together, and,from the structure of the crico-arytenoid joints, this approximation when com-plete is necessarily accompanied with depression. If the muscle is paralysed,the intercartilaginous jiart of the glottis remains patent, although the mem- FifT. Fig. 459.—View of thk interior of thk EIGHT HALF OF THE LARINX (Sappey). 1, ventricle ; 2, sujjerior, and 3, inferiorvocal cord ; 4, arytenoid cartilage coveredhj mucous membrane ; 5, arjiienoid musclecut across ; 6, slope of crico-thyroid mem-brane leading up to inferior vocal cord;6, lower border of cricoid cartilage ; 7, 8,sections of cricoid; 9, its ixpper border;10, section of thyroid; 11, npper part oflarynx; 12, 13, glandular prominence inary-epiglottidean fold; 14, 16, epiglottis;15, fat between it and the thyro-hyoidmembrane; 17, section of epiglottis; 18,section of hyoid bone ; 19, 20, trachea. branous lips can still be arytcno-e2)iglottidcan muscles bothapproximate the arytenoid cartilages,which they include in their embrace,and draw down the epiglottis, so as tocontract the whole superior apertureof the larynx. It is remarked by Henle that themuscles which lie in the space en-closed by the lamtna3 of the thyroidcartilage, a
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