Diagram of the Body Plan
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Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the same in all animals which have a backbone. The plan of the bony skeleton is a central axis from which all other parts are extended. In this lies the central axis of the nervous system, from which its branches also extend.
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Jenkins, Oliver P. Primary Lessons in Human Physiology (Indianapolis: Indiana School Book Company, 1891) 58
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