. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. EDG€ OF ^v.^^y- UMBRELLA -^^ry^h SENSE ORGAN. SAC CONCRETIONS Fig. 157.—Statocysts, the balancing organs in a jelly fish. (After Parker and Haswell: Textbook, of Zoology, published by The Macmillan Company.) sponse is due to reception of mechanical vibrations or to sounds as distinct from mechanical effects is difficult to determine. Special organs for sound reception find their highest development among the higher vertebrates. The essentials of the vertebrate ear are: A membrane under such t
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. EDG€ OF ^v.^^y- UMBRELLA -^^ry^h SENSE ORGAN. SAC CONCRETIONS Fig. 157.—Statocysts, the balancing organs in a jelly fish. (After Parker and Haswell: Textbook, of Zoology, published by The Macmillan Company.) sponse is due to reception of mechanical vibrations or to sounds as distinct from mechanical effects is difficult to determine. Special organs for sound reception find their highest development among the higher vertebrates. The essentials of the vertebrate ear are: A membrane under such tension that it vibrates with the vibrations of the air or water of the environment; a mechanism consisting of a bone or a series of bones which transfers these vibrations to an organ that analyzes the vibrations so that they activate the appro- priate nerve ending. The organ of hearing is associated with an organ which detects changes in position by the dislocation of fluids and small concretions; when the animal changes position these stimulate appropriate nerve endings. Similar organs that function in maintaining position and equilibrium occur in invertebrates (Figs. 157 and 158).. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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