. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 190 ANIMAL ACTIVITIES. every muscle for that purpose is the nervous system. This consists of a brain connected with the spinal cord, and a series of ganglia with nerve connections in the visceral cavity. From these centres nerves run to all parts of the body. The division between brain and spinal cord is not so sharp as in man. The brain itself has the same parts as the brain of man, but these parts do not have the same shape or relative size (Figs, i 5 3 and 154).. Fig. 148.—The Use of a Muscle. Notice how large the olfa
. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 190 ANIMAL ACTIVITIES. every muscle for that purpose is the nervous system. This consists of a brain connected with the spinal cord, and a series of ganglia with nerve connections in the visceral cavity. From these centres nerves run to all parts of the body. The division between brain and spinal cord is not so sharp as in man. The brain itself has the same parts as the brain of man, but these parts do not have the same shape or relative size (Figs, i 5 3 and 154).. Fig. 148.—The Use of a Muscle. Notice how large the olfactory and optic lobes appear in the frog. In man they are small and do not show in the figure. In man, too, the cerebrum or forebrain has grown so large that it occupies almost the whole of the brain-cavity. These facts of structure would seem to indicate that sight and smell are of more im- portance to the frog than memory or reason. Discovery. It is the duty of the nervous system to keep in touch with the outer world, in order that the movements made may be useful to the 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 French, Nathaniel S. (Nathaniel Stowers), 1854-. New York ; London : Longmans, Green, and Co.
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