why our skull is made up of zigzag motion?

Answer 1

Well, the bone structure of the scull develops in separate sessions. The top of the a newly born's scull is like gelatine; it becomes like a bone structure after 5 to 13 months.
Also, I think the zigzag structure is the best way to keep some spherical parts together. If they where straight they could slide like Earth's plates tectonics. In most SF cartoon the main facility/military base/secret laboratory gates are zigzag.

Answer 2

I'm not sure what you mean by zigzag motion. Humans are born with unfused plates of bone forming the skull so that the baby's head can fit through the mother's birth canal. As the child ages, the plates fuse to form a more solid structure (that provides more protection), but it is still possible to see the places where the bones fused (along wavy lines).

Answer 3

The skull is not one piece of bone, but 29 pieces. They are joined by these zig-zags or sutures, which are actually joints allowing a tiny amount of movement, but primarily hold the skull rigidly in place.

Babies are born without these joints, which develop and fuse as they get older, creating a soft spot on the head.

These joint lines can be used in forensics to determine the age of an individual, the older an individual, the more fused and distinct the lines are.

Answer 4

god knows