Eminentia mediana

from Wikipedia, the free encyclopedia

The eminentia mediana (from Latin eminentia 'outstanding, outstanding' and Latin medianus 'lying in the middle') is a neurohemal organ that protrudes into the pituitary stalk (infundibulum) through a collection of vessels in the area of ​​the tuber cinereum . Since the blood-brain barrier is not developed in the neurohemal organs , a barrier to the cerebrospinal fluid is necessary. This is realized in the eminentia mediana by specially differentiated ependymal cells . These long, slender cells, poor in cilia and connected by tight junctions , are called tanycytes .

On special capillary loops of the median eminence axons of neuropeptide -producing neurons from the Regio preoptica , the Regio hypothalamic anterior , from the nucleus ventromedial hypothalamus and arcuate nucleus ( "hypophysiotrope zone" of the hypothalamus). From here, their releasing and inhibiting hormones are passed on to the adenohypophysis via the pituitary portal vein system .

Individual evidence

  1. ^ Hans Frick, Helmut Leonhardt, Dietrich Starck: Special anatomy . Georg Thieme, Stuttgart 1992, ISBN 978-3-13-356904-0 , p. 334 .
  2. ↑ Renate Lüllmann-Rauch: Histology . Georg Thieme, Stuttgart 2009, ISBN 978-3-13-129243-8 , pp. 205 .
  3. ^ Robert F. Schmidt, Gerhard Thews: Physiologie des Menschen . 27th edition. Springer, Berlin 2013, ISBN 978-3-662-00485-2 , pp. 151 .

See also