Actually three: the skin, nervous system and the skeletal system.
When you hit your head your nervous system tells your brain that you are in pain.
Mainly the head but also the neck muscles which support the head.
No
Either face of the head is the hitting surface.
bonk
No, hitting your head with your pillow while you're sleeping has absolutely nothing at all to do with autism and there's no reason to think that it does. If you're hitting your head with your pillow in your sleep this is fairly normal.
Yes, it definitely can. If you feel sick after hitting your head, you should see a doctor.
No
There's no head on a tugo. A tugo is an acoustic guitar with no sound hole, that's played by hitting the body. It's made entirely of wood.
Right after hitting your head, yes. But it should only feel like that for a small amount of time. If it continues, GET TO A DOCTOR
Aunt Polly commonly punished Tom by hitting his head with a thimble.
Hitting the back middle of the head on a shelf can potentially cause a head injury such as a concussion, scalp laceration, or even a skull fracture. It is important to seek medical attention if symptoms such as dizziness, headache, or nausea persist after the injury.