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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.
Wiki User
∙ 10y ago
Wiki User
∙ 11y agoVirtually none of them. Of all the cell processes in all cell classes, to my knowledge the only ones which are myelinated are the axons of neurons.
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Which type of cell produces the myelin covering around the axon of a neuron?
In the central nervous system, neuronal axons are myelinated by oligodendrocytes. In the peripheral nervous system axons are myelinated by Schwann cells.
Why node of ranvier is present on myelinated axon?
Nodes of ranvier are locations of bare cell membrane between segments of myelinated cell membrane. Ion channels responsible for repropagation of action potentials are concentrated at these nodes. Unmyelinated axons have ion channels all over their cell membranes since they do not have myelin segments.
What contains myelinated axons?
Myelinated Fibers.
Are dendrites always myelinated?
No. They are almost never myelinated, but can be.
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"
Sensory neurons of the PNS are?
Unipolar Sensory Neurons: large myelinated neurons with the cell body off to one side of the single dendritic-axon process. Multipolar Motor Neurons: large myelinated neurons that have many dendrites off the cell body and an axon that may branch to effect many effectors.
Does a worm have a myelinated or non-myelinated neuron?
non-myelinated
Which type of cell produces the myelin covering around the axon of a neuron?
In the central nervous system, neuronal axons are myelinated by oligodendrocytes. In the peripheral nervous system axons are myelinated by Schwann cells.
Why node of ranvier is present on myelinated axon?
Nodes of ranvier are locations of bare cell membrane between segments of myelinated cell membrane. Ion channels responsible for repropagation of action potentials are concentrated at these nodes. Unmyelinated axons have ion channels all over their cell membranes since they do not have myelin segments.
Are cell bodies of sensory neurons found in the gray commissure?
Yes, cell bodies are found there. Gray matter is cell bodies; white matter is myelinated axons.
What contains myelinated axons?
Myelinated Fibers.
Are dendrites always myelinated?
No. They are almost never myelinated, but can be.
What is the neurilemma and what is it function?
the plasma membrane surrounding a Schwann cell of a myelinated nerve fiber and separating layers of myelin
Gray matter in the spinal cord is mostly?
unmyelinated axons.
What is the output structure of a neuron?
The axon is the output structure of a nerve cell. Many times it is myelinated like an electrical wire.
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"
Which impulses are faster myelinated or unmyelinated?
Neural transmission is different and MORE rapid in myelinated neurons
