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The brain of an animal and the brain of a human are composed of the same structures and have the same components, but some vary in size in different animals. The human brain is made up of approximately 100-billion nerve cells. The nerve cells have three basic parts: the cell body, the axon, and the dendrites. The brain also has thefollowing parts: the brainstem, which controls the reflexes and the automatic functions, limb movements, and visceral functions; the cerebellum, whi