Dr. John Campbell [ 23 DEC 2013 | Neuro Anatomy ] Basically the brain is in three areas. The brain stem, the cerebellum and the cerebrum. The brain stem controls autonomic functions such as blood pressure, cardiac activity and respiration. The cerebellum controls automatic learned functions such as writing, walking and riding a bike. The cerebrum is the upper part of the brain and makes up the cerebral hemispheres. The cerebral cortex is the outer layer of the cerebrum and is concerned with functions such as thinking, movement, sensation and vision.