Uncal herniation occurs when:
a. The hippocampal gyrus shifts from the middle fossa through the tentorial notch into the posterior fossa.
b. The diencephalon shifts from the middle fossa straight downward through the tentorial notch into the posterior fossa.
c. The cingulate gyrus shifts under the falx cerebri.
d. A cerebellar tonsil shifts through the foramen magnum.
Ans: a. The hippocampal gyrus shifts from the middle fossa through the tentorial notch into the posterior fossa.
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