. Chordate anatomy. Chordata; Anatomy, Comparative. THE SENSE ORGANS 405 Pharyngeal taste-buds occur in larval cyclostomes, while in the adult they are present also on the surface of the head. In elasmobranchs the taste-buds are limited to the lining of the mouth and pharynx, chiefly on the surface of papillae. In ganoids and teleosts they are found on the surface of the head as well as on the pharynx. A few teleosts such as Ameiurus 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 roo
. Chordate anatomy. Chordata; Anatomy, Comparative. THE SENSE ORGANS 405 Pharyngeal taste-buds occur in larval cyclostomes, while in the adult they are present also on the surface of the head. In elasmobranchs the taste-buds are limited to the lining of the mouth and pharynx, chiefly on the surface of papillae. In ganoids and teleosts they are found on the surface of the head as well as on the pharynx. A few teleosts such as Ameiurus 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 FOLIATE PAPILLAE FiG- 357-—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 Sobotta.) 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 epithelium. The cells of the peripheral layer are arranged like 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. 84). 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 & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
