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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The cytoplasm of an axon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The cytoplasm of an axon


Greek axōn + -plasm.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • They proposed three hypotheses for why the membrane potential reverses during a spike: Anion hypothesis: the active membrane becomes selectively permeable to anions which are present in the axoplasm, but are in low or zero concentration in sea water; Inductance hypothesis: the membrane plays the role of an inductor.

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  • The Anion Hypothesis There are certain organic anions present in the axoplasm of a neuron but absent from the extracellular fl uid.

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