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Noun, pl. ganglia

1. A biological tissue mass, most commonly a mass of nerve cell bodies. Cells found in a ganglion are called ganglion cells, though this term is also sometimes used to refer specifically to retinal ganglion cells. (

2. A mass of tissue. (

3. A benign cyst found on aponeurosis or tendon, usually at the wrist or dorsum of the foot. (

4. A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber. (Google Dictionary)

5. An abnormal benign swelling on a tendon sheath. (Google Dictionary)

1. A cluster of interconnecting nerve cells outside the brain. (

2. A network of cells forming a nerve center in the nervous system of an invertebrate. (Google Dictionary)

3. A well-defined mass of gray matter within the central nervous system. (Google Dictionary)

Word origin: From Greek ganglion “tumor,” used by Galen for “nerve bundle.” Of unknown origin; according to Galen, the proper sense of the word was “anything gathered into a ball.” (

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