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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.For information about the typical structure of the human nervous system, see human brain or peripheral nervous system.This article discusses information pertinent to the study of neuroanatomy.
In contrast to animals with radial symmetry, whose nervous system consists of a distributed network of cells, animals with bilateral symmetry have segregated, defined nervous systems, and thus we can make much more precise statements about their neuroanatomy.Silicon is a chemical element with symbol Si and atomic number 14.A hard and brittle crystalline solid with a blue-gray metallic luster, it is a tetravalent metalloid.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.A mid-sagittal plane divides the body and brain into left and right halves; sagittal sections in general are parallel to this median plane, moving along the medial-lateral dimension(see the image above).
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This resulted in a boom of research in neuroanatomy by artists and scientists of the Renaissance Note that such descriptors (dorsal/ventral, rostral/caudal; medial/lateral) are relative rather than absolute (e.g., a lateral structure may be said to lie medial to something else that lies even more laterally).