wikipedia

THE PITUITARY GLAND (HYPOPHYSIS)

The pituitary, 12 by 8 mm in size (like a bean), serves our body in a similar way to that of an inconspicuous general who commands a large army, or the person in the control tower who directs and manoeuvres huge jet planes entering and leaving an international airport. This gland weighs only a few grams and was at one time regarded as a vestigial organ. But when the news of its importance began to spread through the scientific world, and it was even discovered that the anterior and posterior lobes each produce completely different hormones, the amazement was great indeed. Such a small gland, yet one with so many vital functions!

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