Schwann Cell
In the peripheral nervous system, Schwann cells are responsible for forming myelin sheaths around the larger nerve fibres in the PNS. Keep in mind that one Schwann cell myelinates one nerve. You may hear about oligodendrocytes, but these are responsible for myelination in the Central Nervous System, and myelinate multiple nerves.
Oligodendrocyte; processes of the oligodendrocytes form the myelin sheaths around the CNS nerve fibers
No, myelin sheaths actually speed up nerve impulses by increasing the speed of signal transmission along the nerve fibers. This is due to the insulation effect of myelin, which helps to prevent signal loss or leakage.
White matter refers to the parts of the central nervous system that are primarily composed of myelinated nerve fibers. These fibers are responsible for transmitting information between different areas of the brain and spinal cord. White matter appears white because of the high lipid content of the myelin sheaths.
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.
In the peripheral nervous system, Schwann cells are responsible for forming myelin sheaths around the larger nerve fibres in the PNS. Keep in mind that one Schwann cell myelinates one nerve. You may hear about oligodendrocytes, but these are responsible for myelination in the Central Nervous System, and myelinate multiple nerves.
Oligodendrocyte; processes of the oligodendrocytes form the myelin sheaths around the CNS nerve fibers
Your question is not complete. There is not enough information. What are you referring to as "they". Some nerve fibers have thick myelin sheaths and some don't.
Myelin insulation insulates nerve fibers by wrapping around them and forming a protective sheath. This myelin sheath helps to increase the speed of nerve impulse conduction along the nerve fibers.
Several sheaths of connective tissue hold the fibers of a skeletal muscle together. These sheaths from internal to external are the first layer is the endomysium (within the muscle), the second is a layer of fibrous connective tissue called perimysium (around the muscle) and the third is the epimysium , a name that means “outside the muscle.
epineurium, perineurium, endoneuriumEpinerium, perineurium, endoneurium.
what is the portion of the brain containing control certer for body's functions and emotions: means "under the inner rool"
No, myelin sheaths actually speed up nerve impulses by increasing the speed of signal transmission along the nerve fibers. This is due to the insulation effect of myelin, which helps to prevent signal loss or leakage.
myelin sheath
In white matter, the most abundant structures are myelinated nerve fibers, which are composed of axons bundled together with their protective myelin sheaths. These nerve fibers facilitate rapid transmission of signals between different regions of the nervous system.
Motor neurone
White matter refers to the parts of the central nervous system that are primarily composed of myelinated nerve fibers. These fibers are responsible for transmitting information between different areas of the brain and spinal cord. White matter appears white because of the high lipid content of the myelin sheaths.