The cranial cavity ( Cavum cranii ) is the cavity formed by the bones of the brain skull in which the brain is located. In mammals , these are occipital , parietal , temporal , wedge , frontal and ethmoid bones .
The floor of the cranial cavity is formed by the base of the skull and divided into three sections: anterior ( fossa cranii anterior , in animals fossa cranii rostralis ), middle ( fossa cranii media ) and posterior cranial fossa ( fossa cranii posterior , in animals fossa cranii caudalis ).
The roof of the cranial cavity is also known as the skullcap and bears the cerebellar tent ( tentorium cerebelli osseum ) inside as a particularly noticeable protrusion , which sinks between the cerebellum and the cerebrum .
The largest opening in the cranial cavity is the foramen magnum , through which the brain communicates with the spinal cord . There are also numerous other openings for the cranial nerves and blood vessels of the brain to pass through .
The cranial cavity offers good mechanical protection for the brain against external influences. However, space-occupying processes within the cranial cavity ( brain tumors , cerebral hemorrhage , subarachnoid hemorrhage , hydrocephalus , pneumocephalus ) quickly lead to an increase in intracranial pressure (see also Monro-Kellie Doctrine ) and thus usually to brain damage.