What is the oldest and most innermost section of the brain?

Question

Quizplus · Accepted Answer

The brainstem is the oldest and most innermost section of the brain, responsible for controlling basic life-sustaining functions such as breathing, heartbeat, and blood pressure. The medulla is a part of the brainstem, and while important for life-sustaining functions, it is not the oldest or most innermost section of the brain. The thalamus and reticular formation are also parts of the brainstem, but not the oldest or most innermost.

What Is the Oldest and Most Innermost Section of the Brain