The two layers of dura separate from each other at numerous locations to form two unique types of structures (Fig. 8.31A): dural partitions, which project inward and incompletely separate parts of the brain, and intracranial venous structures.
The dural partitions project into the cranial cavity and partially subdivide the cranial cavity. They include the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae.