What is Hypothalamo Hypophyseal tract?
“Hypothalamo-Hypophyseal System” is a descriptor in the National Library of Medicine’s controlled vocabulary thesaurus, MeSH (Medical Subject Headings). A collection of NEURONS, tracts of NERVE FIBERS, endocrine tissue, and blood vessels in the HYPOTHALAMUS and the PITUITARY GLAND.
How is most thyroid hormone transported in the plasma?
The secreted thyroid hormone is largely in the thyroxine (3,3′,5,5′-tetraiodothyronine, T4) precursor form and in smaller quantities in its active form (3,3′,5-triiodothyronine, T3) and is transported in the plasma bound to passive carriers, including albumin, thyroxine-binding globulin, and transthyretin (TTR).
Does the hypophyseal portal system carry ADH and oxytocin?
These hormones enter the hypophyseal portal system, a network of capillaries that connect the hypothalamus to the pituitary. Axons from the hypothalamus reach into the posterior pituitary where they release two hormones, oxytocin (OXT) and antidiuretic hormone (ADH or vasopressin), for storage and later release.
What is the sphenoid sinus?
(SFEE-noyd SY-nus) A type of paranasal sinus (a hollow space in the bones around the nose). There are two large sphenoid sinuses in the sphenoid bone, which is behind the nose between the eyes. The sphenoid sinuses are lined with cells that make mucus to keep the nose from drying out.
What type of hormone requires a carrier protein?
Aldosterone and testosterone are all steroid hormones, and require a carrier protein.
What does the hypothalamo-hypophyseal system mean?
Hypothalamo-Hypophyseal System. A collection of NEURONS, tracts of NERVE FIBERS, endocrine tissue, and blood vessels in the HYPOTHALAMUS and the PITUITARY GLAND.
How is the hypophyseal portal system related to the pituitary gland?
Hypophyseal portal system also known as hypothalamo-hypophyseal portal system, is the system of blood vessels that links the hypothalamus and the anterior pituitary (adenohypophysis). Hypophyseal portal system allows endocrine communication between the hypothalamus and the anterior pituitary gland.
Where does blood flow in 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).
How does the hypophyseal portal system help treat cancer?
In several cases of hypophyseal and pituitary metastatic tumors, the portal system acts as the pathway for metastasis from the hypothalamus to the pituitary. That is, cancerous cells from the hypothalamus multiply and spread to the pituitary using the hypophyseal portal system as a means of transportation.
