Quain's elements of anatomy . along the under surface of the tongue from base to apex, andlying outside the genio-glossus, between that muscle and the hyo-giossus(fig. 499, / i). Posteriorly, some of its fibres are lost in the substance ofthe tongue, and others reach the hyoid bone. In front, having firstbeen joined, at the anterior border of the hyo-giossus muscle, by fibresfrom the stylo-glossus, it is prolonged beneath the border of the tongueas far as its point. The transverse muscular fibres of the tongue (figs. 498, 499, t r)form together with the intermixed fat a considerable part of it
Quain's elements of anatomy . along the under surface of the tongue from base to apex, andlying outside the genio-glossus, between that muscle and the hyo-giossus(fig. 499, / i). Posteriorly, some of its fibres are lost in the substance ofthe tongue, and others reach the hyoid bone. In front, having firstbeen joined, at the anterior border of the hyo-giossus muscle, by fibresfrom the stylo-glossus, it is prolonged beneath the border of the tongueas far as its point. The transverse muscular fibres of the tongue (figs. 498, 499, t r)form together with the intermixed fat a considerable part of its sub-stance. They are found in the interval between the upper and lowerlongitudinal muscles, and they are interwoven extensively with the othermuscular fibres. Passing outwards fiom the median plane, where theytake origin from a fibrous septmn, they reach the dorsum and borders ofthe tongue. In proceeding outwards, they separate, and the superiorfibres incline upwards, forming a series of curves with the concavity Fis. Fig. 498.—Longitudinal tertical section op the tongue, lip, &c. (from Kolliker and Arnold). m, symphysis of the lower jaw ; d, incisor tooth ; h, hyoid bone ; ff h, genio-hyoidmuscle ; g, genio-hyo-glossus spreading along the whole of the tongue ; t r, transversemuscle; I s, superior longitudinal muscle ; g I, lingual glands ; /, lymphoid crypts ; e,epiglottis; I, section of the lip and labial glands; o, cut fibres of the orbicularis oris ; I m,levator menti. 572 THE TONGUE. upwards. The fibres of the palato-glossus muscle are stated by Zaglasand Henle to be continuous with fibres of the transverse set. Vertical fibres (external perpendicular muscle of Zaglas), de-cussating with the transverse fibres and the insertions of the genio-glossus (fig. 499, Jh), form a set of curves in each half of the tonguewith their concavity outwards, and extending down and out from thedorsum to the under surface of the border, so that those which are outer-most are shortes
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