ganglion (n.)youdaoicibaDictYouDict[ganglion 词源字典]
1680s, "tumor, swelling;" 1732 as "bundle of nerves," from Greek ganglion "tumor under the skin," used by Galen for "nerve bundle;" of unknown origin. According to Galen, the proper sense of the word was "anything gathered into a ball."[ganglion etymology, ganglion origin, 英语词源]