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White Matter
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∙ 11y ago
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What region is responsible for the gray coloration seen in gray matter of the CNS?
gray matter represents the cytons and non myelinated axon fibres....so actually the white matter is due to myelin and gray due to nothing but cyton....
Along myelinated sections between nodes in a myelinated axon electrical signals are conducted by?
saltatorial conduction
Why are nerves myelinated?
Some neurons are myelinated so they can carry signals faster.
Is white matter dense in myelinated axons?
Yes White matter is the part of the nervous system that is dense is myelinated axons
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.
Are nerves more myelinated or unmyelinated in the CNS?
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.
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.
Where does the efferent pathways of the parasympathetic division originate from as they leave the cns?
They originate from the cranial and sacral regions of the CNS
What outflow of the sympathetic division occurs from which regions of the CNS?
Thoracolumbar
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.
Does a worm have a myelinated or non-myelinated neuron?
non-myelinated
What type of pain is prickling pain sometimes referred to as that is carried by myelinated type A fibers?
fast pain is best answer.
Regions of CNS tissue that contain axons but not neuronal cell bodies are called?
White matter
What contains myelinated axons?
Myelinated Fibers.
Are dendrites always myelinated?
No. They are almost never myelinated, but can be.
How do you create myelenated neurons?
You don't, but glial cells, (oligodendrocytes in the CNS, and Schwann cells in the PNS), wrapped one after another around the axons of neurons with gaps between them called the nodes of Ravnier do create myelinated neurons.
