BRAIN STEM -its function- and COMPRESSION -what it thus affects: Acting as a relay center, the brainstem connects the cerebrum and cerebellum to the spinal cord. The brainstem performs many automatic functions such as breathing, heart rate, body temperature, wake and sleep cycles, digestion, sneezing, and coughing. Ten of the 12 cranial nerves originate in the brainstem.
As you proceed up the evolutionary ladder from fish toward humans, check out the changes in the brain. For example, the cerebrum gets bigger, takes up a larger part of the total brain and becomes folded.
The Brain: In this video Paul Andersen explains the structures and functions of seventeen major parts of the brain. He begins with a quick discussion of brain evolution and ends with a review of the major parts presented inside the brainstem, cerebellum, thalamus, and cerebrum.