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What is white matter?
Myelinated axons
What is gray matter?
Neuron cell bodies and unmyelinated axons
What is the function of white matter?
Transmit signals
What is the function of gray matter?
Process and integrate information
Where is white matter found?
CNS tracts and PNS nerves
Where is gray matter found?
CNS cortex/nuclei and PNS ganglia
Can neurons regenerate?
Sometimes, but slowly and not perfectly
How long can nerve regeneration take?
Up to 2 years
Why is regeneration often imperfect?
Axons may reconnect incorrectly or die
Can CNS neurons regenerate?
Usually no
Why is PNS regeneration more successful?
Schwann cells assist repair