Which dural septa separates the cerebellum from the cerebral hemispheres:

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Question: Which dural septa separates the cerebellum from the cerebral hemispheres?

Option 1: Falx Cerebelli. This structure runs in the posterior cranial fossa between the two cerebellar hemispheres, so it separates cerebellar hemispheres from each other, not the cerebellum from the cerebral hemispheres. Therefore this option does not answer the question.

Option 2: Falx Cerebri. The falx cerebri is a sickle-shaped dural fold that descends between the two cerebral hemispheres within the longitudinal fissure. It separates the left and right cerebral hemispheres, not the cerebellum from the cerebrum. Hence, this is not the correct septum for the described separation.

Option 3: Diaphragma Sellae. This is a small horizontal dural fold that forms the roof of the sella turcica, covering the pituitary gland. It does not separate the cerebellum from the cerebral hemispheres, so this is not the right choice.

Option 4: Tentorium Cerebelli. This horizontal dural septum separates the cerebellum (below) from the occipital lobes of the cerebral hemispheres (above). It is specifically the structure that creates a divider between the posterior fossa cerebellum and the supratentorial cerebral hemispheres, matching the description in the question.

Summary: Among the listed options, the only dural septum that creates the boundary between the cerebellum and the cerebral hemispheres is the Tentorium Cerebelli, while the other folds serve different separations or coverings within the skull.

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