The human skull is anatomically divided into two parts: the neurocranium, formed by eight cranial bones that houses and protect the brain-and the facial skeleton (viscerocranium) composed of fourteen bones, not including the three ossicles of the inner ear [REF].
The bones of the skull are in three layers: the hard compact layer of the external table (lamina externa), the diploë (a spongy layer of red bone marrow in the middle, and the compact layer of the inner table (Lamina interna) [REF].