Electron microscope studies on the development of the external zone of the mouse median eminence

  • Laila Eurenius
  • Rune Jarskär


The development of the external zone of the median eminence of the mouse was studied in the electron microscope. The examination follows the development of the embryo from the 15th day of the gestation period and the juvenile growth until 24 days of age.

Single terminals of the tubero-infundibular neurons of the external zone were found to extend to the outer basement membrane of the perivascular space of the portal primary capillary plexus in the 16 day-old embryo. In the 18 day-old embryo a narrow external zone has developed. Organization of the external zone into the adult pattern is accomplished at the age of three to four weeks. Small agranular as well as large granular vesicles are present in the tubero-infundibular nerve terminals even in the 16 day-old embryo.

Changes in the organization of the nerve endings along the outer perivascular basement membrane in relation to the ependymal vascular feet were considered.


Median eminence Mouse Growth and development Ultrastructure 


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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • Laila Eurenius
    • 1
  • Rune Jarskär
    • 1
  1. 1.Department of ZoologyUniversity of GothenburgGothenburg 33Sweden

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