3. The largest of the four dural septa, this large, sickle-shaped vertical fold of dura mater separates the left and right cerebral hemispheres. * (2 Points) Falx cerebelli Tentorium cerebelli O Falx cerebri Diaphragma sellae Superior sagittal sinus 4. Clusters of gray matter that contain neuron cell bodies and lie within masses of white matter are the S. (2 Points) cerebral ganglia. ventricles cerebral peduncles. cerebral nuclei. cortices.