Chapter 4

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Brain - nerve cells

The brain contains an estimated 10 to 100 billion nerve cells and about as many supporting cells,which take care of important support and 'housekeeping' functions. 

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White matter

The nerve cells in the cerebral cortex are connected to other parts of the brain by a layer of nerve fibres called the white matter because of the shiny white appearance of the substance that coats and insulates them.

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