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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.
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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.
Which cell process are not myelinated?
According to McGraw Hill (please see related link below): Many nerve fibers in the CNS and PNS are unmyelinated. In the PNS, however, even the unmyelinated fibers are enveloped in Schwann cells. In this case, one Schwann cell harbors from 1 -12 small nerve fibers in grooves in its surface. The Schwann cell's plasma membrane does not spiral repeatedly around the fiber as it does in a myelin sheath, but folds once around each fiber and somewhat overlaps itself along the edges. This wrapping is the neurilemma (also called a mesaxon in unmyelinated nerve fibers). Also, gray matter of the brain and dendrites are unmyelinated, while axons are myelinated.
What system does White matter refer to myelinated fibers?
central nervous system (CNS)
Does saltatory conduction only occur in CNS?
Saltory conduction only occurs in the myelinated axons.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
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.
Myelinated regions of the CNS are referred to as?
White Matter
Which cell process are not myelinated?
According to McGraw Hill (please see related link below): Many nerve fibers in the CNS and PNS are unmyelinated. In the PNS, however, even the unmyelinated fibers are enveloped in Schwann cells. In this case, one Schwann cell harbors from 1 -12 small nerve fibers in grooves in its surface. The Schwann cell's plasma membrane does not spiral repeatedly around the fiber as it does in a myelin sheath, but folds once around each fiber and somewhat overlaps itself along the edges. This wrapping is the neurilemma (also called a mesaxon in unmyelinated nerve fibers). Also, gray matter of the brain and dendrites are unmyelinated, while axons are myelinated.
What system does White matter refer to myelinated fibers?
central nervous system (CNS)
Does saltatory conduction only occur in CNS?
Saltory conduction only occurs in the myelinated axons.
Are cns nerves able to regenerate?
False
What are the nerves that gather information from the environment and carry it to the CNS?
The sensory nerves
What part of the CNS gives rise to sympathetic nerves?
The parts of the CNS that give rise to sympathetic nerves are the thoracic and lumbar regions of the spinal cord.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
Do most nerves within the cns never regenerate?
yes cranial nerves can regenerate
What is the nerves that send messages from the CNS to internal organs?
Motor Neurones send the impulse from the CNS to the effector muscle
What kind of nerves carry impulses toward the cns?
Afferent
