The cranial cavity is the space within the skull that houses the brain. It is formed by the bones of the skull, which protect the brain from injury. The cavity is lined with protective membranes called meninges and contains cerebrospinal fluid, which cushions the brain and helps maintain its shape. This cavity is crucial for the brain's function and overall health. It also provides a passage for nerves and blood vessels that connect the brain to the rest of the body. Any abnormalities or injuries within the cranial cavity can significantly impact neurological function and overall well-being.