cranial

Definition of cranium
National Cancer Institute

cranium

(KRAY-nee-um)
The bones that form the head. The cranium is made up of cranial bones (bones that surround and protect the brain) and facial bones (bones that form the eye sockets, nose, cheeks, jaw, and other parts of the face). An opening at the base of the cranium is where the spinal cord connects to the brain. Also called skull.

Source: NCI Dictionary of Cancer Terms