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The nematode Caenorhabditis elegans has been studied because of its importance in genetics.

In the early 1970s, Sydney Brenner chose it as a model system for studying the way that genes control development, including neuronal development.

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.Commonly used terms for planes of orientation or planes of section in neuroanatomy are "sagittal", "transverse" or "coronal", and "axial" or "horizontal".Again in this case, the situation is different for swimming, creeping or quadrupedal (prone) animals than for Man, or other erect species, due to the changed position of the axis.For information about the composition of animal nervous systems, see nervous system.For information about the typical structure of the human nervous system, see human brain or peripheral nervous system.

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