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  2. Myelin - Wikipedia

    en.wikipedia.org/wiki/Myelin

    Action potential propagation in myelinated neurons is faster than in unmyelinated neurons because of saltatory conduction. The main purpose of myelin is to increase the speed at which electrical impulses (known as action potentials ) propagate along the myelinated fiber.

  3. Action potential - Wikipedia

    en.wikipedia.org/wiki/Action_potential

    An action potential occurs when the membrane potential of a ... Myelinated sections of axons are not excitable and do not produce action ... of the muscle fiber. ...

  4. Node of Ranvier - Wikipedia

    en.wikipedia.org/wiki/Node_of_Ranvier

    Since an axon can be unmyelinated or myelinated, the action potential has two methods to travel down the axon. These methods are referred to as continuous conduction for unmyelinated axons, and saltatory conduction for myelinated axons. Saltatory conduction is defined as an action potential moving in discrete jumps down a myelinated axon.

  5. Saltatory conduction - Wikipedia

    en.wikipedia.org/wiki/Saltatory_conduction

    Myelinated axons only allow action potentials to occur at the unmyelinated nodes of Ranvier that occur between the myelinated internodes. It is by this restriction that saltatory conduction propagates an action potential along the axon of a neuron at rates significantly higher than would be possible in unmyelinated axons (150 m/s compared from 0.5 to 10 m/s). [1]

  6. File:Propagation of action potential along myelinated nerve ...

    en.wikipedia.org/wiki/File:Propagation_of_action...

    The unmyelinated parts of the nerve fiber are nodes of Ranvier. This way of action potential propagation is called saltatory conduction (red arrows in the diagram) Ion channels open, allow sodium ions to enter the cell leading to membrane depolarization and generation of action potential.

  7. Axon - Wikipedia

    en.wikipedia.org/wiki/Axon

    The action potential is the final electrical step in the integration of synaptic messages at the scale of the neuron. [5] Extracellular recordings of action potential propagation in axons has been demonstrated in freely moving animals. While extracellular somatic action potentials have been used to study cellular activity in freely moving ...

  8. Myelinogenesis - Wikipedia

    en.wikipedia.org/wiki/Myelinogenesis

    The studies on a rat optic nerve revealed that 15 days post-natal is when an increase in myelination is observed. Before this time period, most of the axons, roughly about 70%, are not myelinated. At this time, [35S] Sulfate was incorporated into sulfatide and the activity of cerebroside, sulfotransferase reached a peak in enzyme activity. This ...

  9. Biological neuron model - Wikipedia

    en.wikipedia.org/wiki/Biological_neuron_model

    Fig. 1. Neuron and myelinated axon, with signal flow from inputs at dendrites to outputs at axon terminals. The signal is a short electrical pulse called action potential or 'spike'. Fig 2. Time course of neuronal action potential ("spike"). Note that the amplitude and the exact shape of the action potential can vary according to the exact ...