Chapter 4 - Page 99

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The central nervous system

The lower part of the cerebellum and brain stem projects beneath the cerebral hemisphere; the upper part is normally hidden. If the human brain is removed from the skull, it looks as if it has a handle or stem. The brain stem is one of the most primitive regions of the brain, and its functions are correspondingly basic - primarily control of physiological functions and automatic behaviours such as swallowing and breathing. The brains of some animals, such as amphibians, consist primarily of a brain stem and a simple cerebellum. 

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