hypothalamohypophysial portal system
(hī′pō-thăl′ə-mō-hī′pə-fĭz′ē-əl, -zē′-, -hī-pŏf′ĭ-sē′əl)- 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.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.