![]() A nucleus may itself have a complex internal structure, with multiple types of neurons arranged in clumps (subnuclei) or layers. The vertebrate brain contains hundreds of distinguishable nuclei varying widely in shape and size. In anatomical sections, a nucleus shows up as a region of gray matter often bordered by white matter. It is one of the two most common forms of nerve cell organization along with layered structures such as the cerebral cortex or cerebellar cortex. In neuroanatomy, a nucleus is a brain structure consisting of a relatively compact cluster of neurons. ![]() nucleus: A cluster of neuronal bodies where synapsing occurs.ganglion: A cluster of interconnecting nerve cells outside the brain.
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