. Smell, taste, and allied senses in the vertebrates . Senses and sensation; Vertebrates. ANATOMY OF THE OLFACTORY ORGAN 31 and the less distinct proximal zone of basal nuclei. Each of the olfactory nuclei is lodged in an oval cell-body. Proximally this tapers rapidly into a fine olfactory nerve- fiber wliich eventually enters the olfactory bulb of the brain. Distally the body of the cell extends as a somewhat coarser rod-like structure to the outer surface of the olfac- tory epithelium where it ter- minates in a small enlargement. This enlargement has been called the olfactory vesicle by Van
. Smell, taste, and allied senses in the vertebrates . Senses and sensation; Vertebrates. ANATOMY OF THE OLFACTORY ORGAN 31 and the less distinct proximal zone of basal nuclei. Each of the olfactory nuclei is lodged in an oval cell-body. Proximally this tapers rapidly into a fine olfactory nerve- fiber wliich eventually enters the olfactory bulb of the brain. Distally the body of the cell extends as a somewhat coarser rod-like structure to the outer surface of the olfac- tory epithelium where it ter- minates in a small enlargement. This enlargement has been called the olfactory vesicle by Van der Stricht (1909) who ascribed to it a centrosomal origin and believed it to play a significant part in olfactory reception. The olfactory vesi- cle carries a cluster of proto- plasmic filaments, the olfactory hairs. (Fig. 7). These hairs are apparently extremely deli- cate and are easily destroyed; hence they have escaped obser- vation by many workers. They were probably seen in the frog as early as 1855 by Eckhard, but they were first gen- erally identified and thoroughly studied by Schultze (1856, 1862) in a number of vertebrates. Apparently they are never very numerous; Schultze (1862) found that in the frog there were five to six hairs on each olfactory cell (Fig. 8), and von Brunn (1892) and Kalhus (1905) re- corded six to eight in man. Eetzius (1894) noted two to five hairs on each cell in the snake Tropidonotus. Ballo- witz (1904) found ten to twelve or more in Petromyzon, and Alcock (1910) states that in the pig the number varies. Fig. 7.—Isolated olfactory cells and sustentacular cells from man. After von Brunn, 1892, Plate 30, Fig. 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 Parker, George Howard, 1864-1955. Philadelphia ; London : J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsensesa, bookyear1922
