人舌の知覚神経支配に関する補遺的組織学的観察

The dorsum linguae is probably the part best supplied with sensory fibres in the whole body, but the distribution and the terminal mode of these fibres are not uniform in all the different types of the lingual papillae.<br>The sensory terminations found in the filiform papillae comprise uncapsulated glomerular terminations and rather complex branched terminations formed of terminal fibres showing frequent change in size. In the fungiform papillae, the types of terminations are similar to those found in the filiform papillae above, but the glomerular terminations are somewhat less abundant than in the latter. But as the epithelium of these papillae nearly always contains taste-buds and does not show cornification as in the case of that on the filiform papillae, intraepithelial fibres of fine size are found in this epithelium. Beneath the taste-buds, branched terminations formed of thick terminal fibres frequently changing size are found in most cases, and finer intra- and extra-gemmal fibres are sent out from these.<br>The number of sensory fibres coming into the foliate and the vallate papillae is smaller than of those in the filiform and the fungiform papillae, and these form only a few uncapsulated glomerular terminations but mostly relatively simple branched terminations composed of rather fine terminal fibres. These terminations terminate beneath the epithelium, particularly in relation with the taste-buds. Not rarely, however, branched terminations originating in very thick fibres and rather complex in form are found spread out over large areas. A very large number of vegetative fibres are found also running into these papillae, forming terminal reticula in every part of their stock.<br>The facies inferior linguae containe only so-called mucous papillae, so that the sensory fibres in its mucous membrane are much less abundant than those on the dorsum linguae. Comparativeiy large papillae are found in the lateral margins and near the median line of the inferior surface, and some sensory fibres are found running into them to form sensory terminations very similar to those in the filiform papillae above in type but simpler in architecture than these, but most of the smaller papillae are devoid of sensory fibres. Taste-budded papillae are not scarce on this side of the tongue either; in these are found sensory terminations of the same type as those in the fungiform papillae but worse developed than the latter. More rarely, some interesting capsulated glomerular terminations resembling the genital nerve bodies Type I were discovered subepithelially in this part.<br>Such genital body-like capsulated terminations could be found in the propria of the dorsum linguae too. These are usually large in size than those found in the bacies inferior linguae.<br>Sensory terminations are also found along the ducts of the gl, apicis linguae. These comprise not only rather complex branched terminations composed of branched fibres showing frequent change in size but also uncapsulated glomerular terminaions. A part of their terminal fibres run further into the epithelium of the ducts.<br>The most interesting fruit of my study reported herein was the discovery of a rather large number of very peculiar complex branched terminations in the submucosa and the lingual muscle tissue of the apex linguae. These terminations are originated in 1 or 2 thick sensory fibres each, which, upon reaching the terminal area rich in specific cell nuclei, branch out into many branch fibres showing frequent change in size in their utterly irregular looped courses and form neurofibrillar expansions during their courses or at their ends. Thus, they resemble the Type I sensory terminations concerned with the blood-pressure falling reflex, but some are more resembling the genital nerve bodies Type III found in the tunica albuginea of the human penis.