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What
do you think is the functional relationship between the tectospinal
tract of the spinal cord and the corpora quadrigemina of the midbrain?
Why is the tract named “tectospinal”?
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How would a lesion in the cerebellum
affect skeletal muscular function differently than a lesion in the basal nuclei?
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Wallace is the victim of a hunting accident. A bullet grazed his vertebral column and bone fragments cut through the lateral column on one side of his spinal cord. Since the accident, Wallace has had a condition called dissociated sensory loss, in which he feels no sensations of touch or pressure from the ipsilateral side of the body below the injury, and no sensations of pain or heat from the contralateral side. Explain what tract(s) of the spinal cord the injury has affected, and why these sensory losses are on opposite sides of the body.
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- A person can survive destruction of an entire
cerebral hemisphere but cannot survive destruction of the hypothalamus, which
is a much smaller mass of tissue. Explain this difference, and describe some
ways in which cerebral hemispheric destruction could affect the quality of
life.
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Contrast the motor effects of
three types of CNS injuries: (a) stroke that destroys tissue of the left
precentral gyrus, (b) diving accident that severs the cervical spinal cord, and (c)
shrapnel wound that shatters the lumbar vertebrae and severs most nerves of
the cauda equina.
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