<P> In neuroanatomy , a nucleus ( plural form : nuclei ) is a cluster of neurons in the central nervous system , located deep within the cerebral hemispheres and brainstem . The neurons in one nucleus usually have roughly similar connections and functions . 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 . </P>
<P> In neuroanatomy , a nucleus ( plural form : nuclei ) is a cluster of neurons in the central nervous system , located deep within the cerebral hemispheres and brainstem . The neurons in one nucleus usually have roughly similar connections and functions . 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 . </P>
neuron cell bodies found in clusters in the cns are called
neuron cell bodies found in clusters in the cns are called
nucleus
nucleus