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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]].  

The nervous system is 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 two simple [[brain]]s called [[ganglia]].  

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

In the more complex [[vertebrates]] the nervous system is divided into two parts: the [[central nervous system]], composed of the [[brain]] and the [[spinal cord]]; and the [[peripheral nervous system]], which is composed of all the nervous tissue throughout the rest of the body.  

In the more complex [[vertebrates]] the nervous system is divided into two parts: the [[central nervous system]], composed of the [[brain]] and the [[spinal cord]]; and the [[peripheral nervous system]], which is composed of all the nervous tissue throughout the rest of the body.