Manual of human histology . ibres, lastly, belong to the lingualissuperior {chondro-glossus), the lingualis inferior and stylo-glossus, cover the upper surface, the margin, and in part the 14 SPECIAL HISTOLOGY. 172. lower surface, and lie for the most part immediately beneath themucous membrane. The various layersof muscles of the .tongue are invariablyseparated from one another by a thinperimysium, and where larger vessels andnerves run,bythicker masses of connectivetissue; besides which, there are in manylocalities, larger or smaller aggregationsof common fat-cells, which especiallyabound be
Manual of human histology . ibres, lastly, belong to the lingualissuperior {chondro-glossus), the lingualis inferior and stylo-glossus, cover the upper surface, the margin, and in part the 14 SPECIAL HISTOLOGY. 172. lower surface, and lie for the most part immediately beneath themucous membrane. The various layersof muscles of the .tongue are invariablyseparated from one another by a thinperimysium, and where larger vessels andnerves run,bythicker masses of connectivetissue; besides which, there are in manylocalities, larger or smaller aggregationsof common fat-cells, which especiallyabound between the genio-glossi, at theseptum, at the root of the tongue, andunder the mucous membrane. [In the tongue of the Frog very beau-tiful instances of division of the trans-versely striated fibres occur (fig. 172), ofwhich I have not been able to find anycertain trace in man. Occasionally, how-ever, it has seemed to me that the fibresof the genio-glossus exhibited divisionsshortly before their passage into tendinous bands.]. § 132. On the dorsum of the tongue, from the foramen cacura asfar as its point, the mucous membrane difiers from that of therest of the oral cavity, in being very closely united with thesubjacent muscular tissue, and in possessing a great number ofprocesses, the well known lingual or gustatory papill<s. The6—12 papill(B circmnvallata consist, when they are well deve-loped, of a central round papilla, flattened at the end, havinga diameter of i—V and 5—i, or even f bigh; and of alower uniform wall, i—i broad, which closely surrounds thepapilla, particularly at its base. These papilla, however, varymuch in number, size, and position, and occasionally pass intothe fungiform kind; which is especially true of the posteriorones lying in the foramen c<BCum or Morgagnii. The papillae, an-terior to the circumvallatce, are arranged in more or less regular Fig. 172, A branched primitive muscular bundle, of 0-018, from tbc tongue ofthe Frog, x 350. THE T
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