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Aggregate of nerve-cell bodies outside the central nervous system (CNS). The spinal ganglion contains the nerve-cell bodies of the nerve fibres that carry impulses toward the CNS (afferent neurons in dorsal root ganglia) or away from it (efferent neurons in ventral root ganglia).
This entry comes from Encyclopædia Britannica Concise. For the full entry on ganglion, visit Britannica.com.