ハリネズミ舌根部の神経分布

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書誌事項

タイトル別名
  • Innervation of Radical Part of Tongue of Hedgehog
  • ハリネズミ ゼツコンブ ノ シンケイ ブンプ エイブン

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The epithelium of the papilla circumvallata in hedgehog tongue is of noncornified stratified flat type, and is taller on the surface facing the oral cavity than on the sides lining the circumvallating fissure, being provided with occasional taste-buds. On this top surface are found a few grooves sunk into the papillar trunk. No taste-bud is found in the epithelium lining such grooves. These findings are similar to those in dog, but in proportions the former are somewhat smaller than the latter. No taste-bud is formed in the epithelium lining the wall of the circumvallate fissure, as is the case in dog. In the papilla foliata, taste-buds are found in the epithelium facing the oral cavity as well as in the gemmal epithelium lining the side fissure, as in dog.<br>Nerve plexus consisting of thick medullated sensory fibres and thin unmedullated vegetative fibres is found at the basal part of the circumvallate and foliate papillae, as in human and canine tongues, but in development, that in hedgehog is poorer than that in dog. The sensory fibres enter the papillar trunk and go up close to the epithelium to end there in unbranched and simple branched terminations. Nowhere can be found anything resembling the complex corpuscular terminations found in human tongue. Intraepithelial fibres are found in a small number in the epithelium facing the oral cavity of papilla foliata but never in the same place of the papilla circumvallata. Such intraepithelial fibres are unbranched.<br>The development of sensory fibres to the taste-buds in the two kinds of papillae above is somewhat lower in a hedgehog than in a dog. The terminations are generally unbranched or simple branched. Extra- and intragemmal fibres are not very rare and are in general represented by unbranched terminations.<br>The fungiform papillae in the posterior part of hedgehog tongue are morphologically similar in essence to those in man and the sensory innervation thereof resembles closely to the case in dog. Basal plexus of weak development is formed at the basis of the papillar trunk, from which sensory fibres reach out close to the epithelium and end there in unbranched or simple branched terminations. Intraepithlial fibres are often found in the epithelium facing the oral cavity provided with a thin corneate plate. The development of the sensory fibres for the tastebuds is somewhat weak, but intra- and extragemmal fibres are not rare here also.<br>In the mucous membrane of the radix linguae posterior to the sulcus terminalis, almost no lymphatic tissue as seen in human tongue is observable. The formation of mucosal papillae to the epithelium in this part is also very poor. The development of sensory fibres here is proportionately poor, their terminal formation being small in number and unbranched or simple branched in type.<br>However, as the development of mucosal papillae is better in the anterior part of radix linguae, the sensory fibres are also richer in number and their terminations are more complex there. In particular, in the vicinity of the foramen caecum there are found very peculiarly shaped, strongly developed terminations of indefinite form deserving special mention. They are morphologically very near to the special sensory terminations found by SETO in the tarsus of human eye-lid. They belong to the branched type of endings, but the number and the arrangement of the branches is utterly undefinable. The fibres also show very peculiar characteristics, the trunk fibres being very stout in general, the branches showing peculiar change in size and frequent fibril dissolutions in their meandering courses, finally to end in sharp or blunt points.

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