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Where are myelinated neurons especially abundant?
Myelinated neurons are especially abundant in the central nervous system (CNS), which includes the brain and spinal cord. They are also found in peripheral nerves, where they play a crucial role in the rapid conduction of signals to and from different parts of the body.
How do the conduction velocities of unmyelinated axons compare to myelinated axons?
Unmyelinated axons have slower conduction velocities compared to myelinated axons. Myelinated axons are able to conduct nerve impulses faster due to the insulation provided by the myelin sheath.
What is the white matter that lies beneath the cerebral cortex?
The white matter beneath the cerebral cortex is made up of myelinated nerve fibers that connect different regions of the brain. These fibers facilitate communication between different areas of the brain by transmitting electrical signals.
What is the bundle of axons called in the CNS?
Axons and dendrites that go to or from the same region of the body travel together in bundles, somewhat like telephone cables. A nerve is a bundle of axons and/or dendrites in the PNS. A bundle of axons and/or dendrites in the CNS is called a tract.for more info see link below
Can a myelinated axon have a larger diameter than an unmyelinated axon?
Yes, a myelinated axon can have a larger diameter than an unmyelinated axon. Myelin sheath covers the axon, and the diameter of the axon itself can vary independently of myelination. The larger diameter of a myelinated axon allows for faster conduction of nerve impulses compared to unmyelinated axons.
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 axons are found in the central nervous system (CNS) within areas such as the brain and spinal cord, as well as in the peripheral nervous system (PNS) within nerves outside the CNS. Myelin, a fatty substance produced by glial cells like oligodendrocytes in the CNS and Schwann cells in the PNS, wraps around these axons to insulate and speed up the transmission of nerve impulses.
Does saltatory conduction only occur in CNS?
Saltory conduction only occurs in the myelinated axons.
What makes up the Tracts of myelinated axons in the CNS?
The tracts of myelinated axons in the central nervous system (CNS) consist of bundles of nerve fibers surrounded by myelin sheaths. These tracts serve as pathways for transmitting electrical impulses between different areas of the CNS, allowing for communication and coordination of functions within the body. The myelin sheath, made up of specialized cells called oligodendrocytes in the CNS, helps to increase the speed and efficiency of nerve impulse transmission along the 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
Does myelinated axons of the cns make up the white matter of the brain and spinal cord?
Yes, myelinated axons in the central nervous system (CNS) constitute the white matter of the brain and spinal cord. The myelin sheath, which is a fatty substance, surrounds these axons and increases the speed of nerve signal transmission. In contrast, the gray matter primarily consists of neuronal cell bodies, dendrites, and unmyelinated axons. Thus, the distinction between white and gray matter is largely based on the presence of myelinated versus unmyelinated axons.
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.
Where are myelinated neurons especially abundant?
Myelinated neurons are especially abundant in the central nervous system (CNS), which includes the brain and spinal cord. They are also found in peripheral nerves, where they play a crucial role in the rapid conduction of signals to and from different parts of the body.
Where in the CNS and PNS is white matter found?
White matter is found in both the central nervous system (CNS) and the peripheral nervous system (PNS). In the CNS, white matter is located deep in the brain and on the outer part of the spinal cord, consisting of myelinated axons that facilitate communication between different parts of the brain. In the PNS, white matter is present in the nerves outside of the brain and spinal cord, serving to transmit signals between the CNS and the rest of the body.
