The term PART SKULL refers to two specific parts of the skull. The OCCIPUT is the back part of the skull, located at the base of the skull and forming the posterior part of the cranium. It is composed of eight bones and is seven letters long. The inion is a bony protuberance located at the back of the head, at the junction of the OCCIPUT and the two parietal bones. It is five letters long. Together, these two parts form the posterior part of the skull.