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26 Endo Pituitary

26 Endo Pituitary - PITUTARY GLAND page 1 PITUITARY(also...

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PITUTARY GLAND AC Brown page 1 A7d PITUITARY(also called the "Hypophysis") A. Structure 1. Small gland at the base of the brain 2. Divided into the anterior pituitary (also called the adenohypophysis) and posterior pituitary (also called the neurohypophysis); there also is an intermediate region (intermediate lobe) 3. Attached to the hypothalamus by the infundibulum or hypothalamo- hypophyseal stalk, which contains a. nerve axons of neurons originating in the hypothalamus and terminating in the posterior pituitary b. blood vessels originating in capillary beds in the hypothalamus and terminating in capillary beds in the anterior pituitary (portal system) B. Control of Posterior Pituitary Secretion 1. Hormones synthesized in neurosecretory cells of the hypothalamus 2. Migrate down the nerve axons to the posterior pituitary 3. Stored in granules in posterior pituitary nerve terminals adjacent to capillaries 4. Released into the circulation upon stimulation of the neurosecretory cells 5. Release controlled by neural excitation & inhibition of the
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