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==Dura mater==

==Dura mater==

The Dura mater is the outer menix and is made up of a dense fibrous connective tissue. In the cranium, the dura layer is fused with the periosteum and therefore is in effect single layer without an epidural space. The dura contains a number of folds throughout it's coverage of the brain including the ''Falx cerebri', a midline fold between cerebral hemispheres, the ''Tentorium cerebelli'', an  oblique fold between the cerebrum and cerebellum and the ''Diaphragma sellae'' which forms a collar around the neck of the pituitary and forms the roof of the hypophyseal fossa. This layer and these associated folds all provide structural support to the brain and prevent the brain from undergoing excess movement within the skull. Where the dura mater folds between brain tissues it splits into two distinct layers that are seperated by large blood filled spaces called venous sinuses. Venous sinuses are directly connected to the venous system and venous blood from vessels supplying the brain return to the heart via these sinuses.  

The Dura mater is the outer menix and is made up of a dense fibrous connective tissue. In the cranium, the dura layer is fused with the periosteum and therefore is in effect single layer without an epidural space. The dura contains a number of folds throughout it's coverage of the brain including the ''Falx cerebri'', a midline fold between cerebral hemispheres, the ''Tentorium cerebelli'', an  oblique fold between the cerebrum and cerebellum and the ''Diaphragma sellae'' which forms a collar around the neck of the pituitary and forms the roof of the hypophyseal fossa. This layer and these associated folds all provide structural support to the brain and prevent the brain from undergoing excess movement within the skull. Where the dura mater folds between brain tissues it splits into two distinct layers that are seperated by large blood filled spaces called venous sinuses. Venous sinuses are directly connected to the venous system and venous blood from vessels supplying the brain return to the heart via these sinuses.  

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