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Depending on the number of sheaths ,nerve fibres are of two types :-
- Myelinated (Medullated) Nerve Fibre.
- Nonmyelinated (NonMedullated) Nerve Fibre.
Myelinated (Medullated) Nerve Fibre.:-are those nerve fibres which are covered by two sheaths ,myelin & neurolemma.
Nonmyelinated (NonMedullated) Nerve Fibre.:-these nerve fibres are devoid of myelin sheath .However,neurolemma is present.
Medullated nerve fibers have a myelin sheath that helps speed up the transmission of nerve impulses, while non-medullated nerve fibers lack this sheath and have a slower conduction speed. Medullated fibers are typically found in the peripheral nervous system, while non-medullated fibers are more common in the autonomic nervous system.
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What is the function of a medullated nerve?
Medullated nerves are covered by a myelin sheath, which helps to increase the speed of electrical impulses traveling along the nerve fiber. This allows for faster and more efficient transmission of signals in the nervous system.
The speed of nerve impulse transmission through the axon of a sensory neuron will be quickest in?
I'm guessing; "myelinated nerve fibres" contrary to the much slower "non-myelinated nerve fibres"
Why the transmission of nerve impulse is faster in medullated nerve fiber than in non-medullated nerve fiber?
Transmission of nerve impulse is faster in myelinated (medullated) nerve fibers compared to unmyelinated (non-medullated) fibers because the myelin sheath acts as an insulating layer that helps in speeding up the propagation of the action potential. In myelinated fibers, the action potential "jumps" from one node of Ranvier to the next, a process known as saltatory conduction, which allows for faster transmission. In contrast, in unmyelinated fibers, the action potential travels continuously along the entire length of the nerve fiber, which is slower and less efficient.
Why does a brain hemorrhage within a region of the right internal capsule results in paralysis?
Internal capsule contains all the nerve fibres coming from motor area of brain. So hemorrhage result in paralysis of the oposite side of the body. As there is crossing of nerve fibres to oposite side.
What do you mean by taste buds?
the taste buds is a suppilers with nerves. when wet food passes through these taste buds, the nerve fibres carry the sensations of taste to the brain.
What is the function of a medullated nerve?
Medullated nerves are covered by a myelin sheath, which helps to increase the speed of electrical impulses traveling along the nerve fiber. This allows for faster and more efficient transmission of signals in the nervous system.
The speed of nerve impulse transmission through the axon of a sensory neuron will be quickest in?
I'm guessing; "myelinated nerve fibres" contrary to the much slower "non-myelinated nerve fibres"
A bundle of nerve fibers?
The bundle of the nerve fibers is a collection of the threadlike extension of the nerve cell that consists of the myelin sheath and axon in the nervous system. There are nerve fibers in the peripheral nervous system and the central nervous system.
Where does the sodium-potassium pump work?
Along nerve fibres.
What is medullary?
Medullary (myelin)- sheath is the covering of nerve fibres. It insulates the nerve fibre (axon) and prevents leakage of ions.
Dos a nerve damaged in surgery repair itself in due course?
The nerve fibres are covered by endoneurium. For a nerve fibre to repair this endoneural layer needs to be present. There are two types of nerve fibres--myelinated and non-myelinated. The myelinated nervefibres are covered by myelin sheath made of schwann cells. These schwann cells have the capacity to secrete substances which repair the nerve fibre. But, the non-myelinated ones don't have a full layer of schwann cells around them. So, they generally don't repair easily once being damaged. However, in any case, endoneurium should be present for a nerve fibre to repair. In damage of nerve fibre during surgery if the nerve is cut, it means the endoneurium is also cut(damaged) at that site. So, usually that nerve can not repair on its own.
What is an axonopathy?
An axonopathy is a disorder or disruption of the functioning of the axons - the nerve fibres which conduct nerve impulses away from the body of the cell to a synapse.
What is axonopathy?
An axonopathy is a disorder or disruption of the functioning of the axons - nerve fibres which conduct nerve impulses away from the body of a cell to a synapse.
Why the transmission of nerve impulse is faster in medullated nerve fiber than in non-medullated nerve fiber?
Transmission of nerve impulse is faster in myelinated (medullated) nerve fibers compared to unmyelinated (non-medullated) fibers because the myelin sheath acts as an insulating layer that helps in speeding up the propagation of the action potential. In myelinated fibers, the action potential "jumps" from one node of Ranvier to the next, a process known as saltatory conduction, which allows for faster transmission. In contrast, in unmyelinated fibers, the action potential travels continuously along the entire length of the nerve fiber, which is slower and less efficient.
Pelvic splanchnic nerve contains?
Parasympathetic fibres arise from S2,S3,S4. Carry preganglionic parasympathetic and visceral afferent fibres from pelvic and genital organs.
What is the function of a Krause Corpuscle?
The main function of a Krause Corpuscle is sensory. It is small oval capsule that is in the medullated fibers in connective tissue. It helps with sensations in nerve-based organs like the eyes, parts of the reproductive systems, some joint synovial membranes, nerve trunks, and facial mucous membranes.
What color is the choroid?
choroid is black in colour with a lot many nerve fibres to nourish the organ that is eye.
