Table of Contents
What does the pituitary portal system do?
The hypophyseal portal system is a system of blood vessels in the microcirculation at the base of the brain, connecting the hypothalamus with the anterior pituitary. Its main function is to quickly transport and exchange hormones between the hypothalamus arcuate nucleus and anterior pituitary gland.
What is the Hypothalamohypophysial portal system?
[ hī′pō-thăl′ə-mō-hī′pə-fĭz′ē-əl, -zē′-, -hī-pŏf′ĭ-sē′əl ] n. A system of veins that originate in the hypothalamus and pass through the pituitary gland and into its anterior lobe, where they branch into a capillary bed and convey releasing factors to the anterior lobe. GOOSES.
Which could result if blood clots blocked the vessels of the hypothalamo hypophyseal portal system between the hypothalamus and the anterior pituitary gland?
what happens when a blackade of the hypothalamic-pituitary portal vessel occurs? -if there is a blood clot completely blocking the hypothalamic-pituitary portal vessel (happens in new mothers sometimes) we see that hypothalamic releasing fatcors will be unable to reach the anterior pituitary.
What are two main benefits of having a portal system connect the median eminence of the hypothalamus with the anterior lobe of the pituitary gland?
One benefit of the portal system is that it ensures that the controlling hormones will be delivered directly to the target cells. Secondly, because the hormones go directly to their target cells without first passing through the general circulation, they are not diluted.
What are the disorders of the pituitary gland?
Pituitary Disorders
- Acromegaly.
- Craniopharyngioma.
- Cushing Disease / Cushing Syndrome.
- Growth Hormone Deficiency.
- Nonfunctioning Pituitary Adenoma.
- Prolactinoma.
- Rathke’s Cleft Cyst.
Why is it called the hypophyseal portal system?
The name of the portal system indicates the location of the second capillary network. In the hypophyseal portal system, blood flows from capillaries in the hypothalamus into portal veins that carry blood to capillaries of the anterior pituitary (see Figure 1).
What organs are in the portal system?
The hepatic portal system is a series of veins that carry blood from the capillaries of the stomach, intestine, spleen, and pancreas to capillaries in the liver. It is part of the body’s filtration system.
Which hormones pass through the hypothalamo-hypophyseal tract?
Cards
| Term NEUROENDOCRINE CELLS ARE? | Definition NEURONS THAT RELEASE HORMONES INTO THE BLOODSTREAM |
|---|---|
| Term WHICH OF THE FOLLOWING HORMONES PASS THROUGH THE HYPOTHALAMO-HYPOPHYSEAL PORTAL SYSTEM? | Definition PROLACTIN-INHIBITING HORMONE |
| Term THE UTERUS IS A TARGET ORGAN OF? | Definition OXYTOCIN |
Which of the following hormones reach the pituitary gland through a portal system and regulates the functions of anterior pituitary?
A major hormone involved in this process is growth hormone (GH), also called somatotropin—a protein hormone produced and secreted by the anterior pituitary gland.
What hormones are transported through portals?
Sleep Hormones TRH, synthesized by the paraventricular nucleus of the hypothalamus, is released into the hypophyseal portal system at the median eminence and ensures production of thyrotropin by the anterior pituitary gland.
Which is transported through hypophyseal portal system?
The hypophyseal portal system is a system of blood vessels in the brain that connects the hypothalamus with the anterior pituitary. Its main function is the transport and exchange of hormones to allow a fast communication between both glands.
What are the two portal systems?
circulatory system Lower vertebrates have two so-called portal systems, areas of the venous system that begin in capillaries in tissues and join to form veins, which divide to produce another capillary network en route to the heart. They are called the hepatic (liver) and renal (kidneys) portal systems.
What is a portal system example?
Portal venous systems are considered venous because the blood vessels that join the two capillary beds are either veins or venules. Examples of such systems include the hepatic portal system, the hypophyseal portal system, and (in non-mammals) the renal portal system.
Which of the following is transported through hypophyseal portal system?
Which hormone reaches the pituitary gland through portal circulation?
AVT and CRH released in the hypophyseal portal system reach corticotropes in the anterior pituitary where they bind specific receptors triggering complex mechanisms of adrenocorticotropic hormone (ACTH) secretion and re-synthesis (Jurkevich, Mikhailova, Madison, Cornett, & Kuenzel, 2010).