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ganglion
Any structure containing a collection of nerve cell bodies in the central nervous system (CNS) or peripheral nervous system (PNS). Plural: ganglia.
The CNS of many invertebrates consists largely of ganglia, connected by nerve cords, variously arranged but usually well developed in the head (cerebral ganglia). In vertebrates the CNS has a different structure but ganglia occur in the PNS (see nerve root) and autonomic nervous system.
A ganglion is also the name of a benign lump, often at the wrist, found close to tendons and containing jelly-like fluid.
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