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== Nervous system == | == Nervous system == | ||
: ''Main Article: [[Nervous system]]'' | : ''Main Article: [[Nervous system]]'' | ||
The '''nervous system''' is a biological system that regulates the body's responses to internal and external stimuli by carrying information to and from all parts of the body through a vast network of nerve cells. It has two basic parts: the central nervous system (CNS) and the peripheral nervous system. The CNS includes the brain and spinal cord, and the peripheral nervous system includes the nerves outside the CNS (i.e. [[muscular system|motor]] and [[sensory system]] functions). | |||
== Olfactory system == | == Olfactory system == |