dear experts you have explained nothing about the pitutary gland....!
Pituitary gland is an endocrine gland about the size of a pea and weighing 0.5 grams in humans. It is not a part of the brain. It is present at the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity.
The pituitary is functionally connected to the hypothalamus by the median eminence via a small tube called Pituitary stalk.