Abstract
The vallate papillae on the tongue of goat are found in its posterior part ranged in two rows in the marginal portions on both sides, counting 12-13per side. These papillae are not much different from those in other mammals, but the excretory ducts of the EBNER's serous glands in them open out not only into the bottom of the narrow furrows surrounding the papillae, but also in part directly into the oral cavity after running through the papillary stocks nearly vertically. Taste-buds are found in a very large number in the side epithelium of the vallate papillae and besides also in the epithelium of the surrounding valla, but not in the roof epithelium of the papillae.
The so-called giant papillae (YAMAMOTO) are distributed backwards to the vicinity of the hindermost vallate papillae, where the former show a slight cornification in their epithelium. Their papillar stocks are well developed even in this part and secondary papillae are in notable formation.
In the mucous membrane further back to the hindermost vallate papillae, tongue papillae are no more found, the surface becoming smooth and even, but elongated slender papillae are found jutting out from the propria into the non-cornified flat epithelium. In the radix linguae of goat we found neither lymphatic follicles nor foliate papillae.
Basal plexus is formed in the basis of the vallate papillae of goat too, but this is poorer in development than in man. REMAK's hemiganglia are often found in this plexus. The nerve cells in them are of sympathetic nature and consist in smallsized apolar cells or multipolar celles with very few nerve processes.
The vallate papillae are supplied with many sensory fibres from the basal plexus. The fibres spread out mostly in the side walls of the papillae, only a far fewer number running up to the roof wall. The sensory terminations are in the latter more simply formed than in the former and no intraepithelial fibres are formed, too. On the other side, the terminations formed in the side walls include some rather complex branched ones, and in some cases they originate in enormously thick fibres and have terminal fibres swelling out just before ending by abrupt thinning down or in club-like ends. Besides, intragemmal fibres ending in taste-buds are not rare here.
Beside sensory fibres, vegetative fibres are distributed in abundance in the vallate papillae. They end in STÖHR's terminal reticula, particularly well developed beneath the epithelium of their side walls.
A relatively large number of sensory fibres are distributed in the giant papillae in the posterior part of the goat's tongue, too. Their terminations are well developed, and in some cases, 2-3 branched terminations are found in the same place, showing the appearance of plexus-like formation. But, unlike in the larger giant papillae in the fore part of the tongue, no intraepithelial fibres are found here, perhaps due to the cornification of the epithlium of the giant papillae here.
The mucous membrane devoid of tongue papillae in the part further posterior to the hindermost vallate papillae is very poor in sensory nerve supply, unlike ther human cunterpart, only unbranched and very simple branched terminations being found in a small number.
The specific end-bulbs are found in the radix linguae not only in the propria mucosae but also often in the various tongue papillae too,
