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Although it is no bigger than a pea, the pituitary gland, located at the base of the brain just beneath the hypothalamus, is considered the most important part of the endocrine system. It's often called the master gland because it makes hormones that control several other endocrine glands.
While the endocrine system is not directly linked to the nervous system, the two interact in a number of ways. The Central Nervous System The central nervous system (CNS) is made up of the brain and spinal cord.