a cerebellar tonsil shifts through the foramen magnum.
the cingulate gyrus shifts under the falx cerebri.
the diencephalon shifts from the middle fossa straight downward through the tentorial notch into the
posterior fossa.
Correct!
the hippocampal gyrus shifts from the middle fossa through the tentorial notch into the posterior fossa.
Uncal herniation (hippocampal herniation, lateral mass herniation) occurs when the
uncus or hippocampal gyrus (or both) shifts from the middle fossa through the
tentorial notch into the posterior fossa, compressing the ipsilateral third cranial nerve
impairing parasympathetic functioncarried in the periphery of the nerve, then the
contralateral third cranial nerve, and finally the mesencephalon, inducing coma.
Question 2
pts
What are the areas of the brain that mediate several cognitive functions, including vigilance, reasoning,
and executive functions?
Parietal
Occipital
Limbic
Correct!
Prefrontal
It is the prefrontal lobe that mediates several cognitive functions, including vigilance,
reasoning, and executive functions.
Question 3
pts
The body compensates to a rise in intracranial pressure by first displacing
Correct!
cerebrospinal fluid (CSF).
arterial blood.
cerebral cells.
venous blood.
, A rise in intracranial pressure necessitates an equal reduction in volume of the other
contents. The most readily displaced content of the cranial vault is CSF.
Question 4
pts
Subarachnoid hemorrhage causes communicating hydrocephalus by obstructing
the cerebrospinal fluid flow into the subarachnoid space.
Correct!
the absorption of cerebrospinal fluid by the arachnoid villi.
the cerebrospinal fluid flow between the ventricles.
blood flow to the arachnoid villi.
Hydrocephalus from impaired absorption outside the ventricles is called communicating
(extraventricular) hydrocephalus.
Question 5
pts
With receptive dysphasia (fluent), the individual is able to
respond in writing, but not in speech.
You Answered
respond verbally, but not comprehend speech.
Correct Answer
comprehend speech, but not respond verbally.
speak back, but not comprehend speech.
Receptive dysphasia may result in expressive deficits.
Question 6
pts
Dementia is characterized by
easy distractibility and poor concentration.
irritability, agitation, and restlessness.
Correct!
loss of recent and remote memory.
deficits in attention and coherence of thought.
Memory is the most common cognitive ability lost but the dementias are all
characterized by reduction in cognitive functions (intellectual function). Mental abilities
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