Hypophyseal portal system

From the capillary region of the pituitary stalk several Hypophysenpfortadern spring (venae portales hypophysiales ), which in their totality form a network of blood vessels, which also rete mirabile (from the Latin rete, " net", mirabilis, mirabile "wonderful"; " miracle power " ) is called.

This Hypophysenpfortadern dine in the adenohypophysis again a capillary bed. In the first capillary region forming the axons of small cell hypothalamic nuclei. The produced by these nuclei releasing hormones ( Liberine ) CRH, Thyreoliberin, gonadoliberin, Somatoliberin and Inhibiting Hormone ( statins) dopamine and somatostatin are transported from there via the portal veins in high concentration directly to their target cells in the adenohypophysis without first the having to go through the systemic circulation, where they would be highly diluted.

• Vein
• Pituitary