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Most neurons in the body can regenerate axons and dendrites, since they are outcroppings of the neural soma (the cell body). It does this through NGF (nerve growth factor), BDNF (brain-derived neurotrophic factor), and other regulatory mechanisms. In addition, receptors and other neuron "parts" can be regenerated or degraded as needed, based on these regulatory factors.
While it was previously believed that central nervous system neurons cannot regrow, this has been proven to be only half right.
While fully differentiated neurons (already formed brain cells, etc.) cannot regenerate themselves, neuroscientists have found proof of stem cells within the hippocampus that remain well into adulthood. These stem cells can be triggered to divide and regrow NEW brain tissue. However, one can imagine that such regenerative activity is sparse and has to be very carefully regulated...otherwise, overgrowths would result in tumors or disruption of the very connections that make the brain work effectively.
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Do most nerves within the cns never regenerate?
yes cranial nerves can regenerate
Another name for a bundle of nerve fibers is what?
It is called a dendrite.~
How are nerve cells ensheathed in the cns?
The nerve cells are ensheathed in the cns by myelin which is a dielectric material. The myelin layer extends only upto the axon of a neuron. It is essential for the proper functioning of the nervous system.
Specialized supporting cells in the CNS?
The neuroglia ("nerve glue"), or glial cells, which in the CNS include Astrocytes, Ependymal cells, Microglia, and Oligodendrocytes.
Collection of cell bodies found outside the cns?
neurons is the incorrect answer. The correct answer is ganglia.
Does the CNS nerve fibers lack the intrinsic capacity to regenerate while PNS nerve fibers are able to regenerate?
Yes
Are cns nerves able to regenerate?
False
Are one of the major reasons that there is normally no regeneration of nerve fibers in the cns is the presence of growth inhibiting factors?
True
Nerve fibers that conduct sensory signals to the central nervous system is known as?
Nerves that conduct to the CNS are afferent.
What carries impulses from the cns to the effectors?
Eletrical impulses throughout the nervous system
Is myelination of the nerve fibers in the periphreal nervous system the job of the schwann cell?
Yes, in the CNS it is oligodendrocytes that myelinate axons.
Do most nerves within the cns never regenerate?
yes cranial nerves can regenerate
What is the difference between nerve and neuron?
A neuron is an individual cell in the PNS or CNS that can be excited and conduct impulses along its axon. A nerve is a bundle of multiple neuron fibers that each are carrying their own signals. They are protected by connective tissue. Eventually the neuron fibers diverge away from the nerve to reach their destination.
Do the sympathetic fibers leave the CNS at the thoracolumbar region?
All preganglionic sympathetic fibers leave the CNS at the thoracolumbar region, yes.
What is a bundle of nerve processes inside the CNS?
The usual name for a bundle of nerve processes within the CNS is "tract" or "fasciculus"
Where does the spinal nerve take nerve impulses?
the spinal nerve sends nerve impulses away from the CNS
Difference between optic tract and optic nerve?
Bundles of neuron processes are called tracts in the cns and nerves in the pns
