. Comparative anatomy. Anatomy, Comparative. THE SENSE ORGANS 579 surface of the head as well as on the pharynx. A few teleosts such as amiurus have taste buds on the surface of the trunk, fins, and mouth. In amphibia, with the assumption of a land life, taste buds become limited to the tongue and the roof of the mouth. In man, they are found on the tongue, especially on the sides of the vallate papillae, upon the soft palate, and upon the posterior surface of the epiglottis. A taste-bud is an ovoid cluster of columnar epithelial cells, each of which extends from the basement membrane to the f
. Comparative anatomy. Anatomy, Comparative. THE SENSE ORGANS 579 surface of the head as well as on the pharynx. A few teleosts such as amiurus have taste buds on the surface of the trunk, fins, and mouth. In amphibia, with the assumption of a land life, taste buds become limited to the tongue and the roof of the mouth. In man, they are found on the tongue, especially on the sides of the vallate papillae, upon the soft palate, and upon the posterior surface of the epiglottis. A taste-bud is an ovoid cluster of columnar epithelial cells, each of which extends from the basement membrane to the free surface of the FOLIATE PAPILLAE Fig. 478.—The dorsal surface of the tongue. The sulcus terminalis divides the body or apex of the tongue from the root. The two regions have a different embryonic origin. (Redrawn after Sobotca.) epithelium. The cells of the outer layer are arranged like the sections of a melon, so that the ends of the cells are brought close together around a small pore, which opens on the surface. Two kinds of cells are differen- tiated, peripheral supporting cells, and sensory taste-cells, which form the core. The sensory cells stain more intensely, and are distinguished by the bristle-like process in which each cell terminates. (Fig. 99) To stimulate the taste cells, substances must be dissolved, so that they can penetrate the pore-like opening of the bud. Only four kinds of sub- stances can be tasted by us, sweet, sour, bitter, and salt. Other flavors are smelled, not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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