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CHAPTER II. - THE NERVOUS SYSTEM OF MAN.
Lesson 90 - 1. Principal parts - p.378
1. The nervous system, the medium of action, pervades the entire body of man. An intricate net-work of nerves lies over the surface of the body, spreads through its members, and is gathered in certain lines and centres of nervous communication. There is no pin-point on the skin that does not disclose the presence of nerves; nor an organ which does not show itself when diseased to be wrought into the nervous web.
The collective mass, made up of the cerebrum, the cerebellum, the pons Yarolii, the medulla oblongata and the spinal cord, constitutes the nervous centre, the cerebrospinal axis.
"Beginning with the spinal cord, which we have seen to be a rod or column of white matter or fibres, enclosing a slender core of grey substance if we trace the fibres of the cord upwards, we find them continuing into the medulla oblongata, the first and the lowest portion of the brain. Of the whole mass of fibres entering the medulla oblongata, the larger portion pass up into the pons Yarolii and the cerebellum, while a, part terminates in the grey substance of the medulla itself; and from that grey substance other fibres take their rise and proceed onward, in the company of the through-going fibres of the cord. Thus the emerging white matter of the medulla oblongata is partly the fibres that entered it as a continuation of the cord, and partly the fibres originating in the grey central matter of
