Where does the pituitary gland sit?
Protrudes off the bottom of the hypothalamus
What are the two lobes of the pituitary glands?
Anterior and Posterior
What connects the two lobes of the pituitary to the hypothalamus?
Anterior Pituitary AKA
Posterior Pituitary AKA
What controls the pituitary gland hormone secretion?
Which is made up of neural tissue?
The posterior pituitary
Which is made up of glandular cuboidal epithelial tissue?
The anterior pituitary
What is the connection made up of from the hypothalamus to the posterior pituitary?
a bundle of axons called the: hypothalamic hypophyseal tract
What is the connection made up of from the hypothalamus to the anterior pituitary?
vasculature called the: hypophyseal portal system
Which lobe is ADH (vasopressin) released from?
Which lobe is oxytocin released from?
Which lobe is ACTH released from?
which lobe is TSH released from?
which lobe is GH released from?
which lobe is prolactin released from?
which lobe is FSH and LH released from?
What stimulates the release of ADH?
low blood volume or BP
high plasma osmolality
What inhibits the release of ADH?
high blood volume or BP
low plasma osmolality
What is the supraoptic nucleuss?
axons going down to the posterior pituitary where vesicles hold ADH
What is the main physiologic action of AVP?
to increase water reabsorption by the collecting ducts of the kidneys
What does a decrease in water loss in the urine due?
limits a further rise in osmolality of the blood and conserves blood volume.
What leads to the excessive production of dilute urine?
Low blood AVP levels
What is the paraventricular nucleus?
Axons to the posterior pituitary where oxytocin is synthesized and stored in vesicles
What stimulates the release of oxytocin?
nursing or suckling
What is the hypothalamus connected to the anterior pituitary by?
When and from where is the adrenocorticotropin hormone (ACTH) secreted?
Secreted from the anterior pituitary in response to corticotropin-releasing hormone from the hypothalamus.
What is the thyrotropin releasing hormone (TRH) regulated by?
negative feedback of thyroid hormones (the higher the serum levels of these hormones, the lower TSH release)
What does the growth hormone releasing hormone (GHRH) act on?
target cell, somatrope cell in anterior pituitary which releases growth hormone (GH)
What does prolactin inhibiting hormone (dopamine) (PIH) act on?
target cell, lactotrope cell which releases PIH.
Increased amounts of PIH will inhibit the release of what?
What does the pre-optic nucleus release?
gonadotropin releasing hormone (GNRH)