When Does Uncal Herniation Occur

Multiple Choice

When does uncal herniation occur?

A) When the hippocampal gyrus shifts from the middle fossa through the tentorial notch into the posterior fossa
B) When the diencephalon shifts from the middle fossa straight downward through the tentorial notch into the posterior fossa
C) When the cingulate gyrus shifts under the falx cerebri
D) When a cerebellar tonsil shifts through the foramen magnum