The central nervous system (CNS) is the part of the nervous system
that integrates the information that it receives from, and
coordinates the activity of, all parts of the bodies of bilaterian
animals-that is, all multicellular animals except sponges and
radially symmetric animals such as jellyfish. It contains the
majority of the nervous system and consists of the brain and the
spinal cord. Some classifications also include the retina and the
cranial nerves in the CNS. Together with the peripheral nervous
system, it has a fundamental role in the control of behavior. The
CNS is contained within the dorsal cavity, with the brain in the
cranial cavity and the spinal cord in the spinal cavity. In
vertebrates, the brain is protected by the skull, while the spinal
cord is protected by the vertebrae, and both are enclosed in the
meninges.
General
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