The adrenal glands are two small glands the size of a teaspoon that together weigh less than half an ounce. They are triangular shaped and sit on top of each kidney.
Each adrenal is composed of a central core, called the medulla, and an outer crust, known as the cortex—meaning “bark” or “rind. Even though the cortex and medulla are very close physically, they function independently of each other. Therefore, they usually are described separately.