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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.
The pituitary gland is located in your brain, directly under your hypothalamus. This gland is tiny, about the size of a pea, but it plays a large role in your endocrine system. The pituitary gland is composed of two lobes - the anterior (front) and posterior (rear), each of which produces different hormones.