the.com/cranium
the bony helmet your brain demanded before the species evolved actual helmets
means The cranium is the bony part of the skull that encloses and protects the brain.
from From Medieval Latin cranium, lifted from Greek kranion, meaning skull or upper part of the head. That in turn traces back to kara, head — a word with deep Indo-European roots, possibly a cousin of the same ancient source that gave Latin cerebrum (brain) and even, more distantly, our word horn. So when you say cranium, you're echoing a very old way of pointing at the top of the body.
- fused plates
- Eight bones knit into one at adulthood
- baby gaps
- Soft spots let infant skulls flex through birth
- thickness
- Averages just 6.5 millimeters of protection
- sutures
- Wavy seams lock bones like jigsaw teeth
- weight
- Roughly 1.4 kilograms guarding three pounds of thought