False colour nuclear magnetic resonance (NMR) image of a transverse section through a normal human brain. Fat under the skin of scalp, and bone comprising the skull appear as varying shades of blue. The image shows the clear demarcation of the outer grey and inner white matter which forms the cerebral hemispheres (the cerebrum - the bulk of brain tissue). The outer grey matter (the cerebral cortex) appears red-brown, with the underlying white matter showing up yellow varying to blue/green. The white areas represent cerebro- spinal fluid (CSF), which bathes the brain and fills the ventricles (chambers) at its centre.

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