ganglion

Definition ganglion

ganglion: ganglion n. (pl. ganglia) 1. (in neurology) any structure containing a collection of cell bodies and often also numbers of synapses. In the *sympathetic nervous system chains of ganglia are found on each side of the spinal cord, while in the *parasympathetic system ganglia are situated in or nearer to the organs innerved. Swellings in he prosterior sensory *roots of the spinal nerves are termed ganglia (or nuclei); for example, the *basal ganglia. 2. an abnormal but harmless swelling (cyst) that sometimes forms in tendon sheaths, especially at the wrist.