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Brain Damage (DAMAGE
DUE TO
CEREBRAL
ISCHEMIA (Does not develop…
Brain Damage
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CLOSED-HEAD INJURIES
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Contusions:
closed-head injuries that involve damage to the
cerebral circulatory system; hematoma (bruise) forms :explode:
Concussions:
a disturbance of consciousness following a blow to
the head and no evidence of structural damage :explode:
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DEGENERATION
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Retrograde
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Progresses slowly;
if the regenerating axon makes a new synaptic contact,
the neuron may survive.
NEURAL REGENERATION
Does not proceed successfully in mammals and other higher vertebrates:
the capacity for accurate axonal growth is lost in maturity.
Regeneration is virtually nonexistent in the CNS ofadult mammals
and unlikely, but possible, in the PNS
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NEURAL REORGANIZATION
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Lesion one retina and remove the
other; V1 neurons that originally
responded to the lesioned area now
respond to an adjacent area.
Remapping occurs within minutes.
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