. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. SPECIAL SENSES 369 epidermal tissue of the skin (fig. 183). It is believed that those end organs that give the sense of pain lie nearer the surface, while those for the sense of warmth lie more deeply in the skin. The pressure spots are very dose together at the tips of the fingers and on the tongue, a condition which makes these places very sensitive to touch. Most parts of the body are covered with fine hairs. Physiologists have shown that pressure points lie over the hair follicles, and that
. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. SPECIAL SENSES 369 epidermal tissue of the skin (fig. 183). It is believed that those end organs that give the sense of pain lie nearer the surface, while those for the sense of warmth lie more deeply in the skin. The pressure spots are very dose together at the tips of the fingers and on the tongue, a condition which makes these places very sensitive to touch. Most parts of the body are covered with fine hairs. Physiologists have shown that pressure points lie over the hair follicles, and that the pressure nerve fibrils end in a ring surrounding the hair follicle. Any movement of the hair, therefore, stimulates the nerve Fig. 183. Papillae of skin in palm of hand (epidermis removed). E, end organ of nerve; N, nerve; B, blood-vessels; V, capillaries. (After Sappey.). Sense of taste.—The sense of taste is carried to the brain through nerve fibers that have their end organs in the mouth-cavity, particularly on the tip, the borders and the back of the tongue. The circumvallate papilla shown in fig. 184 are the largest taste papillae, but are few in number. In all of the taste papillae there are found certain minute organs formed of a mass of delicate cells each ending in a microscopic hair which projects at the surface of the organ. These organs are called taste buds and are the true sense cells, the hair- like process being the part that is stimulated by substances. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; McCracken, Mary Isabel. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
