Cranial cavity

All the bones of the cranium contribute to delimitate the cranial cavity (Cavum cranii)* in which the brain is lodged. The brain is the more important part of the central nervous system, with its meninges. This cavity is opened caudally by the foramen magnum, that puts it in communication with the vertebral canal.

*The cranial cavity is incompletely divided by the bony tentorium (Tentorium cerebelli osseum), a strong transversal relief, into two unequal parts: the vast rostral cerebral cavity, and the caudal cerebellar cavity; the two parts communicate largely through the cerebro-cerebellar opening.