Anatomy of what is below the skull

Having said that, the skull has five bones: four are like walls, and one is like a base. These walls are created harder than the parietal bone, because damage from falls and impacts happens to them more often, in addition, the skull and parietal bone are more necessary to be porous for two reasons. One reason is that vapors released from the brain must pass through them, and the other is so that these bones do not burden the brain. The hardest part of the walls is their back part, because it is deprived of protection from external senses. The first wall is the frontal bone. It is bounded above by a coronal suture, and below by another seam, which stretches from the end of the coronal suture and passes above the eyes, near the eyebrows. Its end is adjacent to the second end of the coronal suture.

The walls located on the right and left are the bones in which the ears are located. Due to their hardness, they are called “pebbles”. Each of them is bounded above by a scaly suture, and below by a suture that runs from the end of the lamboid suture and passes further, ending at the coronal suture. They are limited in front by part of the coronal suture, and behind by part of the lambdoid suture. As for the fourth wall, it is limited above by the lambdoid suture, and below by a suture common to the skull with the sphenoid bone, which connects the ends of the lambdoid suture.

And the base of the brain forms the bone that carries all the other bones of the skull. It is called wedge-shaped and is designed to be very hard for two purposes. One of these benefits is that hardness helps the sphenoid bone to support the skull; the other is that. that hard bone is less susceptible to rotting from excesses released from the brain. This bone is located in such a way that secretions are constantly poured onto it from above, so nature took care of its compaction. There are two hard bones on each side of the temples that cover the nerves that run through the temples. They are located along the temples, obliquely, and are called a “pair”.