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Neural backpropagation
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<p>Neural backpropagation is the phenomenon in which, after the <a href="/facts/Action_potential/Sz8yCRqx">action potential</a> of a <a href="/facts/Neuron/G7CyTVdH">neuron</a> creates a voltage spike down the <a href="/facts/Axon/5DCd4wLo">axon</a> (normal propagation), another impulse is generated from the <a href="/facts/Soma_(biology)/L8aDnXKr">soma</a> and propagates towards the <a href="/facts/Apical_dendrite/IXq3BjRw">apical</a> portions of the dendritic arbor or <a href="/facts/Dendrites/bwv8MABY">dendrites</a> (from which much of the original input current originated). In addition to active backpropagation of the action potential, there is also passive <a href="/facts/Electrotonic/80Q41dUJ">electrotonic</a> spread. While there is ample evidence to prove the existence of backpropagating action potentials, the function of such action potentials and the extent to which they invade the most distal dendrites remain highly controversial. </p>