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In vertebrates, the nervous system is segregated into the internal structure of the brain and spinal cord (together called the central nervous system, or CNS) and the routes of the nerves that connect to the rest of the body (known as the peripheral nervous system, or PNS).
The delineation of distinct structures and regions of the nervous system has been critical in investigating how it works.
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The brain is small and simple in some species, such as the nematode worm, where the body plan is quite simple: a tube with a hollow gut cavity running from the mouth to the anus, and a nerve cord with an enlargement (a ganglion) for each body segment, with an especially large ganglion at the front, called the brain.
The nematode Caenorhabditis elegans has been studied because of its importance in genetics.
This immensely increases the capacity of researchers to distinguish between different cell types (such as neurons and glia) in various regions of the nervous system.We are hoping for a peaceful cooperation in the new year and..don't pay attention to the flying discs in the sky.Another year is drawing to a close and, following tradition, there will be great fireworks and food and celebration to send off the past year and welcome the new one!The first known written record of a study of the anatomy of the human brain is the ancient Egyptian document the Edwin Smith Papyrus.The next major development in neuroanatomy came from the Greek Alcmaeon, who determined that the brain and not the heart ruled the body and that the senses were dependent on the brain.