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developmental program by which a neuron kills itself at a certain age unless inhibited from doing so
fetal alcohol syndrome
condition resulting from prenatal exposure to alcohol and marked by decreased alertness, hyperactivity, varying degrees of mental retardation, motor problems, heart defects, and facial abnormalities
focal hand dystonia
"musician's cramp", a condition in which the touch responses to one finger overlap those of another, leading to clumsiness, fatigue, and involuntary movements
nerve growth factor
protein that promotes the survival and growth of axons in the sympathetic nervous system and certain axons in the brain
undifferentiated cells that can divide and produce daughter cells that develop more specialized porperties
closed head injury
sharp blow to the head resulting from a fall, an automobile or motorcycle accident, an assault, or other sudden trauma that does not actually puncture the brain
newly formed branch from an uninjured axon that attaches to a synapse vacated when another axon was destroyed
increased sensitivity by a postsynaptic cell after removal of an axon that formerly innervated it
increased sensitivity by a postsynaptic cell because of decreased input by incoming axons
local insufficiency of blood because a blood clot or other obstruction has closed an artery
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