ROBERT FLYNT / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY ROBERT FLYNT / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Human nervous system. Collage illustration of the central nervous system (CNS) showing the spinal cord, a silhouette of a male figure containing nerves, and an outstretched human torso. The CNS consists of the brain (top left) and spinal cord (centre left) which integrate nervous activity. There are 31 pairs of nerves that branch off the spinal cord; they form a network that communicates with the rest of the body. At right, spinal cord nerves in the figure are seen supplying the face, scalp, heart, and abdomen. This nerve anatomy allows the human body to respond to stimuli, to move, to feel, and to make intelligent choices.
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