Structure and Function
The pituitary gland is suspended by a stalk from the hypothalamus at the base of the diencephalon.
It rests in a depression in the sphenoid bone called the sella turcica, behind the optic chiasm.
It has two major divisions.
The pituitary gland is at the base of the brain, about 1cm in diameter, lying beneath the third ventricle in a bony cavity (sella turcica) in the base of the skull. (See Gross Anatomy: Pituitary Gland
The pituitary gland is composed of three lobes: anterior, intermediate and posterior.