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Updated: October 25, 2026
The nervous system, though in many respects a unit, consists of two great sections, called respectively, the ganglionic system, and the cerebro-spinal; the latter formed by the brain, the spinal cord, and the medulla-oblongata, that connects them; the former, constituted by smaller masses of nervous matter distributed in three ways: First, in a double chain lying on each side of the spinal cord, from the upper part of the neck to the pelvic cavity that terminates the trunk.