neuron cell bodies found in clusters in the cns are called
Nucleus (neuroanatomy) In neuroanatomy, a nucleus (plural form: nuclei) is a cluster of neurons in the central nervous system,[1] located deep within the cerebral hemispheres and brainstem.[2] The neurons in one nucleus usually have roughly similar connections and functions.[3] Nuclei are connected to other nuclei by tracts, the bundles (fascicles) of axons (nerve fibers) extending from the cell bodies. A nucleus is one of the two most common forms of nerve cell organization, the other being layered structures such as the cerebral cortex or cerebellar cortex. In anatomical sections, a nucleus shows up as a region of gray matter, often bordered by white matter. The vertebrate brain contains hundreds of distinguishable nuclei, varying widely in shape and size. A nucleus may itself have a complex internal structure, with multiple types of neurons arranged in clumps (subnuclei) or layers.