The brain stem is located
between the cerebrum and the cerebellum. This part of the brain controls the involuntary
muscles. It also regulates heartbeat rate, breathing rate, blood circulation, and
digestion. If injured, it causes all those things to stop. A nickname for the brain stem
is called the medulla. The brain stem is connected to the bodys back spine. The
brain stem has three parts; the pons, the midbrain, and the medulla oblongata.