The limbic system is not just one part of the brain but contains many different parts of the brain, creating a system. These multiple brain structures are located above the brainstem, under the cortex.
My favorite system the limbic system contains glands which help relay emotions. Many hormonal responses that the body generates are initiated in this area. The limbic system includes the amygdala, hippocampus, hypothalamus and thalamus.
Anatomy of anxiety, including goings-on in both the body and brain. Like most powerful states, anxiety is a total mind-body experience! --somehow, reading everything I can about how anxiety and panic work calms me.