PS263 Chapter Notes - Chapter 4: Peripheral Neuropathy, Peripheral Vision, Phantom Limb
Document Summary
After first few days following brain damage, many surviving brain areas increase or reorganize their activity to compensate. After brain damage in one hemisphere, its input to the other hemisphere declines and thus the other hemisphere shows deficits also. Recovery from a stroke depends largely on increasing activity for opposite side of brain. Decreased activity of surviving neurons after damage to other neurons. Damaged axons that extend into limbs grow back toward the periphery at a rate of about. 1mm a day following myelin sheath to original target. Damaged axons do not regenerate in mature mammalian brain or spinal cord. A cut in nervous system causes thick scar to form, creating mechanical barrier that blocks regrowth of axons later. Neurons on the two sides of the cut pull apart. Glia cells that react to cns release chemicals that inhibit axon growth. Surface of denrites and cell bodies is covered with synapses that don"t stay vacant for long.
