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What is the difference between myelinated and unmyelinated nerves?
Wiki User
∙ 11y ago
structurally they are very similar with the only real difference being that the myelinated (M) nerve (neurone) has schwann cells on its axon surface, but functionally they are very different as the M transmitts nerve impulses alot faster than the non-myelinated(NM) as it has nodes ranvier that allow the impulse to jump from gap to gap between schwann cells and so sppeding the rate at which it can depolarise the membrane to allow transmittion of the impulse, i could go on alot more but i wont :) hope this helps
yours scincerly a uni student trying to look smart ;)
i got to OXFORD (brookes) ...
Wiki User
∙ 11y ago
Wiki User
∙ 13y agomyelin sheath is an insulator that allows faster transmission of the electrical impulse along the axon
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A myelinated nerve fiber is characterized as being whereas an unmyelinated?
Myelinated nerves are white, and composes the white matter of the brain and spinal cord they also are able to pass an action potential down an axon much faster; Unmyelinated nerves are gray, and composes the gray matter of the brain and spinal cord. These nerves transmit signals much slower
Are nerves more myelinated or unmyelinated in the CNS?
Nope. They can be found in the PNS as well. The myelinated ones in the CNS are made my Schwann cells. And the ones made in the PNS are made by oligodendrocytes.
What is the relationship between nerve size and conduction velocity?
velocity proportional to square root of diameter
What is the relationship between size of nerve and conduction velocity?
For unmyelinated nerves there is a relationship between axon diameter and conduction velocity. Larger diameter nerves conduct faster. For myelinated nerves the a larger diameter nerve will conduct faster between the nodes of ranvier where the action potential is propagated. Conduction is said to be saltatoryas it jumps from node to node.
What nerve cells can you use to distinguish colors?
It depends on the tissue. Most nerves are too small to see individually, but there are bundles that can be viewed with the naked eye or a good dissecting microscope. Nerves can be myelinated, which means that they coated with a fatty layer to speed signal transmission. Most peripheral nerves and those not in the cortex of the brain are myelinated and thus appear white. Unmyelinated nerves are grayish, which is where the term "gray matter" comes from.
What is the name for bundles of myelinated axons in the PNS?
nerves
Why are nerves myelinated?
Some neurons are myelinated so they can carry signals faster.
Which neuron is never myelinated?
Neurons that do not have a myelin sheath must use continuous conduction, which is slower. These are the smaller axons of the CNS, as well as some types of fine sensory fibers, such as olfactory nerves.
When do fetal nerves become myelinated?
five months intrauterine life
How does conduction differ on myelinated vs unmyelinated axons?
Very simples, myelinated axons have a myelin sheath! These are produced by the schwann cells in the Peripheral Nervous System and oligodendrocytes in the Central Nervous System. The myelin sheath is made out of lipids (fats) and proteins. The benefits of a myelinated axons is a faster transmission of an electrical impulse and also insulation. The breakdown of a myelin sheath from a medical background results in Demyelination.Tortora, G, Derrickson, B (2009) Principles of Anatomy and Physiology, Wiley, Asia, 12th Edition, Volume 1, Pages 416-423Hope this helps!
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
What is the difference between a unconditioned reflex and a conditioned reflex?
does not involve nerves
