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more on structure
The CNS contains several cavities called the [[ventrical system]]. Tissue surronding the ventrical system is the primary producer of [[cerebrospinal fluid]] which surrounds the CNS providing a medium for communication between [[neurons]] and as a cushion in case of trauma.
The CNS contains several cavities called the [[ventrical system]]. Tissue surronding the ventrical system is the primary producer of [[cerebrospinal fluid]] which surrounds the CNS providing a medium for communication between [[neurons]] and as a cushion in case of trauma.
Neurons and [[axons]] are distributed non-uniformly through the CNS. The [[soma|cell body]] and [[dendrites]] of the neurons cluster in [[cortical]] regions which are essentially flattened sheets of cells called [[laminae]]. These areas are located primarily on the cerebral hemispheres or in areas beneath the surface of all the sub-divisions of the CNS called [[nuclei]]. Axons are then distributed through out the system in regions called tracts. In live tissue the regions populated by cell bodies and dendrites appear gray while the tract's of axons appear white. These areas are called [[gray matter]] and [[white matter]] respectively.
==The brain stem and cerebellum==
==The brain stem and cerebellum==