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five months intrauterine life
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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 contains myelinated axons?
Myelinated Fibers.
Are dendrites always myelinated?
No. They are almost never myelinated, but can be.
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
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"
What is the name for bundles of myelinated axons in the PNS?
nerves
Why are nerves myelinated?
Some neurons are myelinated so they can carry signals faster.
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.
How many cranial nerves does a fetal pig have?
10
A myelinated nerve fiber is characterized as being whereas an unmyelinated?
Myelinated nerves are white, and composes the white matter of the brain and spinal cord they also are able to pass an action potential down an axon much faster; Unmyelinated nerves are gray, and composes the gray matter of the brain and spinal cord. These nerves transmit signals much slower
Does a worm have a myelinated or non-myelinated neuron?
non-myelinated
What is the relationship between nerve size and conduction velocity?
velocity proportional to square root of diameter
What fibers are the most rapid nerve impulses conducted on?
These are nerves in animals. They include central and peripheral; peripheral include somatic and autonomic.
What contains myelinated axons?
Myelinated Fibers.
How fast does nerves send messages to the brain?
It varies from nerve to nerve (from 1 meter per second to 100 meters per second). The nerves to the voluntary muscles are myelinated, and thus are at the high speed end of speeds.
Are dendrites always myelinated?
No. They are almost never myelinated, but can be.
What nerve cells can you use to distinguish colors?
It depends on the tissue. Most nerves are too small to see individually, but there are bundles that can be viewed with the naked eye or a good dissecting microscope. Nerves can be myelinated, which means that they coated with a fatty layer to speed signal transmission. Most peripheral nerves and those not in the cortex of the brain are myelinated and thus appear white. Unmyelinated nerves are grayish, which is where the term "gray matter" comes from.
