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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.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agono one say that brain and spinal chord neurons are unmyelinated because that answer is just wrong. Many of them are heavily myelinated, but they have axons covered by oligodendrocytes instead of schwann cells, which make up the myeline sheath in the peripheral nervous system. however, gray matter in the brain is mostly made up of soma and unmyelinated fibers.
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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"
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.
What contains myelinated axons?
Myelinated Fibers.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
Does a worm have a myelinated or non-myelinated neuron?
non-myelinated
What is speed of myelinated neuron?
50 m/sec
Are muscles and glands myelinated?
Muscles and glands are not myelinated. It is the axon of a neuron that is myelinated. The myelin forms a layer called myelin sheath that makes the nervous system function properly.
Are the nodes of ranvier only found on myelinated peripheral neuron processes?
Yes.
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"
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.
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.
Does impulse travel faster along myelinated neuron?
Yes, impulses travel faster in myelinated axon rather than in unmyelinated. It is mostly due to nodes of Ranvier. Instead of travel along the axon, in myelinated axon impulses "jump" from node to node. Also there are two types of myelinated axons: type A and type B. (Type C in unmyelinated axon.) Type A is the fastest among all of them.
What is white matter in the brain composed of?
largely or entirely composed of nerve fibers and contain few or no neuronal cell bodies or dendrites.
What contains myelinated axons?
Myelinated Fibers.
How many synapses occur in this reflex arc?
there are 2 - one between the sensory and relay neurones; the other between the relay and motor neurones.
