[Slyfox]

That is not what a crematory technician told me. I won't describe exactly what he said but let me assure you that when the temperature is high enough anything that looks like a human head will bust open quickly.

Besides, the holes you mention have a number of tissues between the inside of the skull and the outside of the head that impede a direct connection to the outside world.

If there were no such tissues our brains would get easily infected.

[BwanaNdege]

Interesting!