Conduction of Nerve Impulse
During the resting Phase, the nerve fibres have a +ve charge on the outer surface i.e. polarised state. The polarization is due to presence of Na+ ions on the outer surface. On stimulation, the axon terminal permits the inward movement of Na+ ions which causes depolarization. The area is known as the excited region. The depolarised region stimulates the neighboring region as a result it depolarises.
Meanwhile, Na+ ions actively transport to the outside membrane and cause polarization of the depolarised area. This sequential activity reaches the terminal end of the axon which stimulates the synaptic vesicle to release neurotransmitters. these neurotransmitters then reach the dendrite of the next neuron and in this way conduction of the nerve impulse take place.
Properties and Classification of Nerve Fibres
Nerve fiber, also known as an axon, is a long, thin projection found on nerve cells (neurons) responsible for nerve impulses’ conduction through the nerve cell body. Nerve fibers show properties including conductivity, velocity, refractive period, summation, and accommodation. They can sense stimuli and carry electrical impulses. Nerve fibers are classified based on conduction velocity, size, and presence or absence of myelin sheath into groups A, B, and C.
In this article, we will study in detail Nerve Fibres, their structural properties, the Conduction of nerve impulses, the Numerical classification of nerve fibers, and nerve fibers in invertebrates.
Table of Content
- What are Nerve Fibers?
- Structural Properties of Nerve Fibers
- Conduction of Nerve Impulse
- Classification of Nerve Fibres
- Numerical Classification of Nerve Fibers
- Nerve fibres in Invertebrates
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