Episode 05

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Well done David.

The whole petrified thing has its own issues.

For example, did Senku have petrified skin on his neck, or was his neck petrified at that spot all the way down to this spinal cord? Are they implying that mending the skin above the spinal cord fixes that as well, or was it only fixed because the entire structure was stone and thus now repaired?

If the latter, then that would imply that Senku's spinal cord was still functional despite being petrified.

("Cervical nerve" doesn't make much sense in English. I'm going to guess they meant the cervical portion of his spinal canal. Technically with a severed cervical spinal cord you can still live since your vertebral and carotid arteries are intact - but if he was hit with such force then the vertebral arteries being intact would also be somewhat unlikely.

The heart can still beat, but without C3-5 your diaphragm would likely stop contracting - and they hit him quite high up at the base of the foramen magnum there).