Quain's elements of anatomy . 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 conti
Quain's elements of anatomy . 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 shortest. tr^ Fig. 499. — Transverse VERTICAL SECTION OF THETONGUE IN FRONT OF THEPAPILLA ;, SEENFROM BEFORE (from Kol- liker). ff, the genio-hyo-glossimuscles ; g, the verticalfibres of the right side traceduj^wards to the surface ; I i,inferior longitudinal musclewith the divided ranine ar-tery ; t r, transverse muscle,entire on one side, but par-tially removed on the other,where the other muscles passthrough it; c, septum lin-guae ; h, hyo-glossus ; hg I,its fibres spreading upwardsalmost vertically outside thegenio-hyo-glossiis ; h, vertical fibres reaching the surface ; I s, divided plates of the fibresof the superior longitudinal muscle between the vertical fibres ; s t. g J, styjo-glossus ; d,glands near the border of the tongue. Examined in transverse sections, the muscular fibres are seen to be arranged soas to render the substance divisible into an outer part or cortex and an internalor medullary jDart. The fibres of the coi-tex are principally longitudinal, derive
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