Your sensory cells take it to the spinal cord and it tells the motor nerves, which causes it to pull the hand back. The brain gets the message after the action. Voluntary Voluntary actions are when you want to do something and you think about it first. If you pet a dog and you want to scratch the dog your brain tells your motor nerves and your mussels do that action. The motor nerve takes it down the spinal cord to the limb that does the brain s order.
Some handicapped people take more time for their actions to happen.
The brain is made of three parts. A cerebrum, cerebellum and a brain stem. The cerebellum is the little area under the cerebrum. It controls location, if you are lying down or sitting it tells your brain. The cerebrum controls almost everything.