Definition of "ganglion" []

• Anatomy A group of nerve cells forming a nerve center, especially one located outside the brain or spinal cord. (noun)
• A center of power, activity, or energy. (noun)
• Pathology A benign cystic lesion resembling a tumor, occurring in a tendon sheath or joint capsule. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Nerve fibre outgrowth from the chick ganglion is determined after 24 hours."
• ""The word ganglion {ganglee-on) is (keek for "knot" and was originally used by Hippocrates and his school for knotlike tumors beneath the skin."
• "These in turn communicate with nerve cells in a third layer, known as the ganglion cells, that send their fibers into the optic nerve (Fig. 160)."