lower brain is called
The parts of the lower brain are collectively referred to as the brain stem, which is the most primitive part of the brain.The brain stem serves as a &ldquo;highway&rdquo; that connects the upper brain and the cerebellum to the spinal cord, and through the spinal cord and peripheral nerves, to the rest of the body.The lower brain is responsible for a variety of functions, most notably processes essential to survival.ignificance. Many noteworthy regions within the parts of the lower brain make essential connections with other parts of the brain. For example, the substantia nigra is a nucleus in the midbrain that provides important input to the basal ganglia for the control of voluntary movements.