Cranial cavity

The cranial cavity is the space enclosed by the bones of the skull, which houses the brain, the most important part of the central nervous system, along with its meninges.

It is open caudally by the foramen magnum, connecting it to the vertebral canal via the atlas.

This cavity is partially subdivided into two unequal parts by the tentorium, a prominent bony ridge. The first, rostrally located and larger, is the cerebral cavity. The second, caudally located and smaller, is the cerebellar cavity. They communicate with each other through the cerebellar-cerebral opening.