ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Brain. Wire-frame computer artwork of a healthy human brain, seen in profile. The front of the brain is at right. The convoluted outer layer of the brain, the cerebral cortex, is folded into gyri. The cerebral cortex is rich in nerve cells and is involved in conscious thought, sensation and movement. The cerebellum (rounded structure at lower left) and brainstem (bottom left) control subconscious automatic functions such as breathing (brainstem) and body posture (cerebellum). The human brain weighs around 1.4 kilograms in adults.
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