The skull, which protects the brain, weighs approximately 4 kg and is made up of 22 bones: 8 of them form what is called the cranial vault; the remaining 14 bones are in the face. All the bones of the skull are fixed except the lower jaw, which forms the jaw. When we are born, the bones of the skull are separated to allow the growth of the brain and they close in adulthood. The separations of the bones that make up the cranial vault are called sutures. At the bottom of the skull there is a hole, called the foramen magnum, which connects the cranial cavity with the spinal canal, giving way to the medulla oblongata, to the vertebral arteries, and to the spinal cord. This infographic from the Ábaco collection is integrated into the Human Body series, which includes also the original titles: Skeleton, Woven Bone, Body Axis and Joints.