Outlines of human physiology . 256 Nervous Sijste?n of Vertebral Tn vertebral animals theceatral organ consists of adouble chord, or spinal mar-row, tile greater part con-tained in the vertebral ca-nal, a smaller part extend-ing uider the name of me-dulla oblongata into thecrania cavity, where no-dules are formed upon it,which are called the he spinal chord andmedula oblongata nervesarise n pairs, which aredistributed to all parts ofthe bcdy. The figure re-presen,s the brain and spi-nal chard of a pigeon. Ihave skown in it the ven-tricle which is found in thatpart of the s
Outlines of human physiology . 256 Nervous Sijste?n of Vertebral Tn vertebral animals theceatral organ consists of adouble chord, or spinal mar-row, tile greater part con-tained in the vertebral ca-nal, a smaller part extend-ing uider the name of me-dulla oblongata into thecrania cavity, where no-dules are formed upon it,which are called the he spinal chord andmedula oblongata nervesarise n pairs, which aredistributed to all parts ofthe bcdy. The figure re-presen,s the brain and spi-nal chard of a pigeon. Ihave skown in it the ven-tricle which is found in thatpart of the spinal chord,where the nerves of thelower extremities take theirorigin. Of the Mental Properties of Animals. 257 The principle of improvement in the nervous systemthroughout the ascending scale of animals is the pro-gressive accumulation of nervous matter in largermasses upon that part of the central organ, which isnearest the head or mouth. In proportion as this al-teration from the simplest type of organization iseffected, the animal becomes more and more indivi-dualiz
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