. Animal biology. Biology; Zoology; Physiology. Cell body Axon Coverings of axon Terminal D^ branches Fig. 138. — Neurons. Stages in the differentiation of nerve cells. A, prim- itive neuron from the nerve net of Hydra-like animals; B, motor neuron of the Earthworm; C, D, primary motor neurons of a Vertebrate. the ganglia, are in physiological continuity one with another by 'transmitting contacts,' or synapses; but each neuron, it is be- lieved, remains structurally distinct. (Figs. 138, 139, 143.) 1. Brain and Spinal Cord It will be recalled that the first great differentiation during the dev
. Animal biology. Biology; Zoology; Physiology. Cell body Axon Coverings of axon Terminal D^ branches Fig. 138. — Neurons. Stages in the differentiation of nerve cells. A, prim- itive neuron from the nerve net of Hydra-like animals; B, motor neuron of the Earthworm; C, D, primary motor neurons of a Vertebrate. the ganglia, are in physiological continuity one with another by 'transmitting contacts,' or synapses; but each neuron, it is be- lieved, remains structurally distinct. (Figs. 138, 139, 143.) 1. Brain and Spinal Cord It will be recalled that the first great differentiation during the development of a multicellular animal establishes an outer ecto- derm and inner endoderm, and thus separates the functions of protection and general reactions to the environment from that of nutrition. It is natural therefore that the ectoderm should be-. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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