Axoplasm


Axoplasm

Axoplasm is the cytoplasm within the axon of a neuron. Neural processes (axons and dendrites) contain about 99.6% of the cell’s cytoplasm, and 99.7% of that is in the axons (Sabry et al., 1995).

Axoplasm has a different composition of organelles and other materials than that found in the neuron's cell body or dendrites. In axoplasmic transport, materials are carried through the axoplasm to or from the soma.

The electrical resistance of the axoplasm, called axoplasmic resistance, is one aspect of a neuron's cable properties, because it affects the rate of travel of an action potential down an axon. If the axoplasm contains many molecules that are not electrically conductive, it will slow the travel of the potential because it will cause more ions to flow across the axolemma (the axon's membrane) than through the axoplasm.

References

* Sabry J., O’Connor T. P., and Kirschner M. W. (1995). Axonal Transport of Tubulin in Ti1 Pioneer Neurons in Situ. "Neuron". 14: 1247-1256.


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  • axoplasm — noun Etymology: axon + plasm Date: 1900 the protoplasm of an axon • axoplasmic adjective …   New Collegiate Dictionary

  • axoplasm — n. [Gr. axon, axle; plasma, formed or molded] The cytoplasm or neuroplasm of an axis cylinder …   Dictionary of invertebrate zoology

  • axoplasm — The cytoplasm of a neuron …   Dictionary of molecular biology

  • axoplasm — axoplasmic, adj. /ak seuh plaz euhm/, n. Cell Biol. cytoplasm within an axon. [1895 1900; AXO (as comb. form of AXON) + PLASM] * * * …   Universalium

  • axoplasm — noun The cytoplasm of an axon …   Wiktionary

  • axoplasm — Neuroplasm of the axon. SYN: axioplasm. * * * axo·plasm ak sə .plaz əm n the protoplasm of an axon axo·plas·mic .ak sə plaz mik adj * * * n. the semifluid material of which the axon of a nerve cell is composed. It flows slowly outwards from the… …   Medical dictionary

  • axoplasm — n. protoplasm of an axon …   English contemporary dictionary

  • axoplasm — axo·plasm …   English syllables

  • axoplasm — n. the semifluid material of which the axon of a nerve cell is composed. It flows slowly outwards from the cell body …   The new mediacal dictionary

  • axoplasm — ax•o•plasm [[t]ˈæk səˌplæz əm[/t]] n. cbl the cytoplasm within an axon • Etymology: 1895–1900; axo (see axoneme) + plasm ax o•plas′mic, adj …   From formal English to slang