In the Crash Course video, I learned about the different structures of the brain. Franz Joseph Gall, the first phrenologist, introduced a new theory in the early 1800’s. Gall believed that a person’s personality was linked to the ridges and bumps on the skull. However, scientists today understand that the brain contains different parts that are responsible for specific functions. One system of the brain is commonly referred to as the “old brain”. This inner core layer of the brain keeps the body’s basic functions running smoothly. Another system is the limbic system, which includes the amygdala, hypothalamus, and hippocampus. These structures are responsible for memory, motivation, emotion, and learning. The largest part of the brain is the