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One, and it's about the size of a walnut. Actually, scientists thought for a while the stegasaurus may have had a brain-like structure in it's tail. The expansion of the spinal column in the pelvis gave rise to the incorrect idea that dinosaurs had two brains. Yes, the size of a walnut!
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Wiki User
∙ 13y ago
Wiki User
∙ 12y agoThere's only one brain in human head. However, one brain comprises a lot of nerve impulses that release and transmit chemicals to different parts of the body in order to function well.
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