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what are venous blood sinuses
some areas of the meningeal dura mater that are layers separates by spaces filled with blood (ex.: superior sagittal sinus)
what else can happen in meningeal DM
in other areas the two layers of the meningeal DM are fused and form a partition (ex.: falx cerebri-between two cerebral hemispheres and falx cerebelli-between cerebrum and cerebellum)
what covers the spinal cord
one layer called the meningeal or spinal DM that is continuous with meningeal DM of brain
what is subdural space
potential free space located between the meningeal DM of brain and spinal cord and the arachnoid membrane (Second meninge) ex.: subdural hematoma
what is the arachnoid trabeculae
fine partitions that create compatments within sub-arachnoid space below arachnoid membrane
what is the pia mater
inner meninge that is highly vascularized and is in direct contact with brain and spinal cord
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