The answer to your question is,
The Brain Stem. It is connected to the spinal cord and controls almost everything in our body.
-Mabel <3
The primitive part of our brain would be the brain stem. The part of the brain that connects to the spinal cord. The brain stem controls functions basic to the survival of all animals, such as heart rate, breathing, digesting foods, and sleeping. It is the lowest, most primitive area of the human brain.
