GJLP / SCIENCE PHOTO LIBRARY GJLP / SCIENCE PHOTO LIBRARY
Brain in head. Coloured three-dimensional magnetic resonance imaging (MRI) scan of a sagittal (side) view of a human head containing a cross-section of a healthy brain. The main part of the brain is the fissured cerebrum (at upper centre), the site of conscious brain activity. This encloses the corpus callosum, thalamus and basal ganglia at the centre of the brain (all blue), which link the two halves of the cerebrum and the brainstem together. Both the branched cerebellum (at centre right) and the elongated brainstem (blue) to its left control vital bodily functions. MRI scanners use pulses of radio waves to form "slice" images which are compiled into a 3-D image by computer.
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