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a strong fold of dura mater roofing over the posterior cranial fossa with an anterior median opening, the tentorial notch, through which the midbrain passes; the tentorium cerebelli is attached along the midline to the falx cerebri and separates the cerebellum from the inferior surface of the occipital and temporal lobes of the cerebral hemisphere.
Synonym(s): cerebellar tentorium ☆
a horizontal projection of the meningeal dura mater that covers and separates the cerebellum in the posterior cranial fossa from the posterior parts of the cerebral hemispheres. It is attached posteriorly to the occipital bone and laterally to the superior border of the petrous part of the temporal bone. The anterior and medial borders of the tentorium cerebelli are free, forming an oval opening into the midline through which the midbrain passes. Also called tentorium cerebelli. Compare cerebellar falx, cerebral falx.