The parietal and temporal bones form the sides and top of the cranial dome and form the frontal bone forehead The cranial floor is composed of spanoid and ethmoid bones. In humans, the basis of the cranium is the occipital bone, which has a central opening (foreman magnum) to accept the spinal cord. Atlas Next-down vertebrae allow lateral movement on the axis. In humans, the skull is supported by the superior vertebrae, called atlases, which allow movement. In most other animals, the skull face is larger than the skull, including the upper part of the skull and the nose. The human cranium, the part that holds the brain, is spherical and larger than the face. The upper jaw, but not the bottom, is part of the skull. The skull is made up of skeletal borders, bones, or cartilage, forming a unit that protects the brain and some sensory organs.
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