Does electrotonic spread/conduction occur in saltatory conduction?
No, electrotonic spread or conduction does not occur in saltatory conduction. Saltatory conduction is a mode of electrical conduction specific to myelinated axons in the nervous system. In this process, the action potential “jumps” or “hops” from one node of Ranvier to another, skipping the myelinated regions in between.
Electrotonic conduction, on the other hand, is a form of passive conduction that occurs in unmyelinated axons or dendrites. It involves the spread of electrical signals (local potentials) through passive flow of ions along the neuron’s membrane. These local potentials gradually decrease in strength as they propagate along the length of the axon or dendrite.
In saltatory conduction, the myelin sheath acts as an insulating layer, preventing the passive flow of ions across most of the axon’s membrane. This insulation causes the action potential to jump from one node to the next, where the myelin sheath is interrupted, resulting in a faster and more efficient conduction of the electrical signal.
Therefore, electrotonic spread, which relies on the passive flow of ions along the length of the axon, is not involved in saltatory conduction.
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