Nervous System

Nervous System

The nervous system is the part of an animal's body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago.

About Nervous System

The nervous system is the part of an animal's body that coordinates the actions of the animal and transmits signals between different parts of its body. In most types of animal it consists of two parts, the central nervous system (CNS) and peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves, which are long fibers that connect the CNS to every other part of the body. The PNS also includes the enteric nervous system, a semi-independent part of the nervous system whose function is to control the gastrointestinal system. At the cellular level, the nervous system is defined by the presence of a special type of cell, called the neuron, also known as a 'nerve cell'. Neurons have special structures that allow them to send signals rapidly and precisely to other cells.

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