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Question
Which of the following is NOT a way a brain tumor can cause unilateral upper motor neuron dysarthria?
A. A brain tumor may directly cause destruction of nearby upper motor neurons as it grows, degrading the transmission of motor impulses from the higher brain centers to the cranial and spinal nerves.
B. A growing tumor may displace and squeeze upper motor neurons as it becomes larger, with the direct pressure from the tumor compromising the function of the neurons.
C. The growing tumor may compress the arteries or veins serving upper motor neurons and interfere with normal blood flow to or from these cells, causing a negative effect on the function of the neurons.
D. A bilateral brain tumor may grow, causing destruction of nearby upper motor neurons as it enlarges, causing complications to the motor impulses.
Answer
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