The text discusses the formation and structure of the human skull, notably that the top skull bone is made of two pieces joined together. It explains different parts of the skull, like the temporal bones and upper and lower jaw bones, and references illustrations for clarity. The joints in the skull help resist breaking and allow flexibility compared to a single solid structure.
The Human Figures
Describing the head formation; also known as the Top Skull Bone: It is not made from one bone but from two, joined together with joints resembling saw teeth; these joints are distinctly recognizable; as testified by anatomists: see this in illustration B. Some believe that the jaw is set with such joints to prevent it from breaking easily from falls or blows; as seen when a cracked pot breaks less upon impact than a whole one, since the parts can give way in a cracked one; which is not possible in a whole one (because all the parts are tightly stretched and cannot separate before breaking).
4. Temporal Bones, also called both sides of the head: Shaped like scales on either side of the head at the Top Skull Bones; see illustration A and B.
5. The Upper Jaw Bone is part of the skull located above the forehead bone, containing twelve bones that form the eye sockets, teeth, nose, and complete structure of the mouth. See illustration A.
6. The Cheekbone. See illustration A.
7. The Nipple-like projection. See illustration A.
8. The Lower Jaw Bone forms the lower part with a semicircle, containing the case of the teeth. See illustration A.