Everyone has 2 adrenal glands. They are small, about the size of a walnut, and shaped like a pyramid. They sit on top of each kidney. They are sometimes called “supra-renal glands” which is Latin for “above the kidney”.
What do the adrenal glands do? The adrenal glands may be small, but they play an important role in the way you think and feel. The adrenal glands are organs that make and secrete hormones. The hormones produced by these small powerhouses affect the way every tissue, organ and gland in your body works. Each adrenal gland is made up of 2 parts: an inner area called the medulla, and an outer area called the cortex. The adrenal glands play an important role in how your body responds to stress.
Drawing from: http://surrenales.aphp.fr/