Pituitary gland. Light micrograph of a section through the brain showing the pituitary gland (bottom), a hormone-secreting gland at the base of the brain. It is composed of two lobes, the anterior pituitary (orangey brown) and the posterior pituitary (purple and beige). At centre right is the sphenoid bone. The anterior pituitary, under the influence of the hypothalamus (upper left), secretes hormones that regulate physiological processes including growth, reproduction and stress. The posterior pituitary contains nerve fibres that secrete hormones synthesised by the hypothalamus into the blood stream. Magnification: x13 when printed at 10 centimetres wide.
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