The extension of a neuron, ending in branching terminal fibers, through which messages pass to other neurons of to muscles or glands.
Brainstem
The oldest part and central core of the brain, beginning where the spinal cord swells as it enters the skull: the brain-stem is responsible for automatic survival functions.
Cerebellum
The "little brain" attached to the rear of the brain-stem; its functions include processing sensory input and coordinating movement output and balance.
