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Cell and Tissue Research

, Volume 164, Issue 1, pp 11–26 | Cite as

Electron microscope studies on the intermediate lobe of the embryonic mouse

  • Laila Eurenius
  • Rune Jarskär
Article

Summary

The development of the intermediate lobe of the hypophysis was studied in the embryonic C3H mouse; at least four glands from embryos of every gestational day from 15 to 19 were examined.

In the 16 day-old embryo prospective secretory cells proliferate at the centre of the intermediate lobe anlage. At the same stage cylindrical cells bordering the hypophyseal cleft begin to reorganize into marginal cells. By the end of fetal life marginal cells are well differentiated.

In the 17 day-old embryo a few granular inclusions appear in some centrally located cells. Secretory cells increase in number during the following two embryonic days. Some of these cells contain polymorphic populations of granular and vesicular inclusions by gestational day 19. The possibility of a dual formation of secretory inclusions is discussed.

The result implies that the onset of granule-formation by these cells is not contemporaneous with the start of production of melanophore-expanding substances, the presence of which has been detected by earlier biological assays.

Key words

Intermediate lobe Mouse Growth and development Ultrastructure 

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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • Laila Eurenius
    • 1
  • Rune Jarskär
    • 1
  1. 1.Department of ZoologyUniversity of GothenburgFackSweden

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