About the Pituitary Gland
The human endocrine system is a collection of glands which secrete chemical messengers, called hormones, to perform a variety of functions in many different tissues. Glands lack ducts, so the hormones they produce are released directly into the blood stream.
Located at the junction of the optic nerves, called the optic chiasm, on the bottom of the brain, the pituitary gland is a pea-sized gland comprised of three lobes made of two different tissues. The forward portion, or anterior, is called the adenohypophysis. Adeno- is a prefix meaning “glandular", and it is formed from glandular tissues. The rear portion, or posterior, is called the neurohypophysis and is made out of neural tissue. The intermediate portion produces and secretes only one hormone.
Called the “master gland" because it controls the function of many other glands, the hypothalamus actually controls pituitary gland function. That aside, the pituitary gland releases several different hormones which control functions throughout the body. These hormones have both primary and secondary effects.