Section of Spinal Cord

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“Diagram of a slice across the spinal cord, showing the roots of a spinal nerve to the arm on the left. The arrows show which way the messages travel. The little circles are the cut ends of fibers extending up and down the cord. Only a few of the thousands of fibers really present are here shown.” —Davison, 1910


Alvin Davison, Health Lessons (New York: American Book Company, 1910) 158


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