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This question could probably be asked more clearly. Myelinization of a nerve fiber helps the nerve's signalpropagate more quickly. Think of the nerve cell as a length of wire, and the myelin as the rubber insulation on the wire. Each nerve cell allows an electrical signal to pass down it's axon. If there is insulation around the nerve (myelin) then the signal is contained within the nerve cell, and passes quickly to the end of the nerve cell. Demyelinated nerve cells do not have this insulation keeping the electrical signal in the cell; so the signal can travel to adjacent cells. The net effect is that the signal either never reaches the end of the intended axon (such as with multiple sclerosis), or the signal takes longer to get there. Some nerve cells (grey matter, for example) are not intended to be myelinated. These cells are designed to act without insulation, so either the signal is supposed to travel to adjacent cells, or it is supposed to take relatively longer to reach the end of the axon.
What else can I help you with?
Which two characteristics of axons increases the speed of nerve impulse?
diameter and presence of myelination.....
Myelination in the brain serves to?
Myelination in the brain serves to increase the conduction speed of nerve impulses and improve overall communication between different parts of the brain. It also helps to protect and insulate nerve fibers, providing structural support and maintaining the integrity of the neural network.
What reasons may explain difference in conduction rates?
Differences in conduction rates can be attributed to variations in fiber size, myelination, and temperature. Larger fibers conduct signals faster due to less resistance, while myelination increases conduction speed by allowing for saltatory conduction. Temperature can also affect conduction rates, as higher temperatures increase the speed of ion channel activation.
What facilitates the rate of myelination?
Childhood experiences affect the rate of myelination in a child's brain. Myelination is the development of fatty sheaths around neurons, which help neurons communicate better and facilitates learning.
The speed of neurotransmission in the frontal lobe increases during adolescence due to the growth of?
During adolescence, the myelination of nerve fibers in the frontal lobe increases, which enhances the speed of neurotransmission. Myelination insulates neurons and allows for faster communication between brain regions, leading to improved cognitive functions like reasoning, decision-making, and impulse control during this developmental stage.
Which cell is only found in the PNS?
The cell type that is only found in the peripheral nervous system (PNS) is the Schwann cell. Schwann cells are responsible for the myelination of peripheral nerve fibers, which enhances the speed of electrical signal transmission. In addition to myelination, they also play a role in the repair and regeneration of damaged nerves in the PNS.
What affects the speed of nerve transmission and how is it measured?
The speed of nerve transmission can be affected by factors such as the myelination of the nerve fiber, temperature, and the diameter of the nerve fiber. It is measured using techniques such as nerve conduction studies, where electrodes are placed on the skin to measure the speed of electrical impulses along a nerve.
In what part of the brain does myelination occur last?
forebrain
What does gray matter lack that white matter has?
Myelination
What structure is responsible for myelination of the nerve fibers?
In the peripheral nervous system the cell that myelinates an axon is called a Schwann cell. In the central nervous system myelination is carried out by oligodendrocytes.
How does myelination affect the speed of transmission of neural impulses?
Myelination, the process of forming a myelin sheath around nerve fibers, significantly increases the speed of neural impulse transmission. This insulation allows electrical signals to jump between the gaps in the myelin, known as nodes of Ranvier, through a process called saltatory conduction. As a result, myelinated axons can transmit impulses much faster than unmyelinated axons, enhancing communication between neurons and improving overall nervous system efficiency.
How long does full myelination take?
Full myelination of the central nervous system typically occurs by early adulthood. However, the process can vary depending on the specific region of the brain and individual factors.
