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The '''nervous system''' is the set of [[neurons]] and support structures that process and organize information from the [[senses]] and bodily organs, analyze and coordinate appropriate responses and control the behavioral actions of an [[organism]]. All anatomical structures of the nervous system are made up of [[nervous tissue]].  

The '''nervous system''' is the set of [[neurons]] and support structures that process and organize information from the [[senses]] and bodily organs, analyze and coordinate appropriate responses and control the behavioral actions of an [[organism]]. All anatomical structures of the nervous system are made up of [[nervous tissue]].  

Nervous systems first developed in the chordates with the some of the simplest systems represented in [[flatworms]] which has two nerve cords running on opposite sides which connect with a simple [[brain]] called [[ganglia]].  

The Nervous system present in some form in all chordates with the the simplest system represented in the [[flatworms]], which has two nerve cords running on opposite sides that connect to a two simple [[brain|brains]] called [[ganglia]].  

In modern [[vertebrates]] the nervous system is divided into two parts with the [[peripheral nervous system]] being defined as nervous tissue on the periphery of the body, basically everything other than the [[spinal cord]] and brain which are defined as part of the [[central nervous system]].  

In the more complex [[vertebrates]] the nervous system is divided into two parts with the [[peripheral nervous system]] being defined as nervous tissue on the periphery of the body, basically everything other than the [[spinal cord]] and brain which are defined as part of the [[central nervous system]].  

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