Final answer:
The limbic system is a connected set of structures that regulates emotion and memory. It includes the thalamus, hypothalamus, hippocampus, and amygdala. The amygdala plays a role in recognizing fearful faces and the sensation of fear.
Step-by-step explanation:
The limbic system is a connected set of structures that regulates emotion, as well as behaviors related to fear and motivation. It plays a role in memory formation and includes parts of the thalamus and hypothalamus as well as the hippocampus. One important structure within the limbic system is a temporal lobe structure called the amygdala. The two amygdala (one on each side) are important both for the sensation of fear and for recognizing fearful faces.