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If I was paying attention in med school, I think... The pre-ganglionic fibers are myelinated and the post-ganglionic are unmyelinated. This is in reference to the sympathetic and parasympathetic systems.
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∙ 15y ago
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What does non myelinated fibers look like?
Non-myelinated fibers appear as thin, unmyelinated axons within bundles of nerve fibers. They lack the myelin sheath that surrounds some other nerve fibers, which gives them a more transparent or grayish appearance compared to myelinated fibers. Non-myelinated fibers are typically smaller in diameter and conduct nerve impulses more slowly than myelinated fibers.
What is non-myelinated nerve fiber?
Non-myelinated nerve fibers are nerve fibers that lack a protective myelin sheath, a fatty covering that helps speed up the transmission of nerve impulses. These fibers are slower at conducting nerve signals compared to myelinated fibers and are found in structures like pain receptors and autonomic nervous system fibers.
The funiculi all contain what?
The funiculi contain ascending and descending nerve fibers that transmit sensory and motor information between different levels of the central nervous system.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
Would conduction speed of a nerve fiber be the fastest in a large or small myelinated fiber?
The conduction speed of a nerve fiber is fastest in large myelinated fibers. This is because myelin acts as an insulator, allowing for faster propagation of the action potential by saltatory conduction in large fibers compared to small unmyelinated fibers.
White matter of the spinal cord?
it is the substance surrounding the gray matter. It is also composed of myelinated nerve fibers and makes up nerve pathways called tracts.
What does non myelinated fibers look like?
Non-myelinated fibers appear as thin, unmyelinated axons within bundles of nerve fibers. They lack the myelin sheath that surrounds some other nerve fibers, which gives them a more transparent or grayish appearance compared to myelinated fibers. Non-myelinated fibers are typically smaller in diameter and conduct nerve impulses more slowly than myelinated fibers.
What is non-myelinated nerve fiber?
Non-myelinated nerve fibers are nerve fibers that lack a protective myelin sheath, a fatty covering that helps speed up the transmission of nerve impulses. These fibers are slower at conducting nerve signals compared to myelinated fibers and are found in structures like pain receptors and autonomic nervous system fibers.
Masses of myelinated nerve fibers appear?
white
Why do messages not get mixed up passing through the spinal cord?
There are ascending and descending tracts in the spinal cord. These tracts are nerve fibers bundled together. Messages going to the brain pass through the ascending tracts while messages coming from the brain pass through the descending tracts. These separate paths prevent messages from getting mixed up.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
What does white matter contain?
The white matter consist of myelinated nerve fibers.
What is the difference in transmission between myelinated and unmyelinated fibers?
Impulse transmission on an unmyelinated nerve fiber is much slower than the impulse transmission on a myelinated nerve fiber.
What substance slows the message passing from the brain to the rest of the body?
Unmyelinated nerve fibers are slower than myelinated nerve fibers. The fibers covered by myelin are much faster.
Does the white rami communicans contain fibers of a preganglionic or postganglionic neurons?
Preganglionic because they are myelinated. FALSE
What fibers are the most rapid nerve impulses conducted on?
These are nerves in animals. They include central and peripheral; peripheral include somatic and autonomic.
The velocity of nerve impulse conduction is greatest in?
Heavily myelinated, large diameter fibers
