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Myoid cells in the peritubular tissue (lamina propria) of the reptilian testis

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Summary

The arrangement and fine structure of peritubular myoid cells was studied in the testes of three species of reptiles (Lacerta dugesi, Testudo graeca and Natrix natrix) during two short periods of the seasonal cycle (European spring and autumn) and correlated with some ultrastructural properties of Leydig cells. The lamina propria consists of myoid cells, fibroblasts and non-cellular components comprising collageneous and non-striated microfibrils. Both components are arranged in alternating layers surrounding seminiferous tubules. In spring the lamina propria of lacertilian testis shows 1–5 layers of myoid cells which are rich in 50–70 Å filaments and exhibit plasmalemmal and intracellular dense patches, smooth vesicles along the cell membrane and a concentration of organelles in a juxtanuclear position. Leydig cells are rich in smooth ER profiles and have few lipid droplets. In autumn most myoid cells are replaced by fibroblast-like elements. Leydig cells display large numbers of lipid droplets and dense bodies, but only small amounts of agranular ER. Similar changes are noted in Leydig cells of Testudo and Natrix. However, in these species the boundary tissue of seminiferous tubules fails to show significant alterations comparing spring and autumn animals. In both species the lamina propria exhibits a few fibroblast-like cells interspersed among myoid cells.

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Authors and Affiliations

  1. Department of Zoology, University of Melbourne, Parkville, Victoria, Australia

    K. Unsicker

  2. Department of Anatomy and Embryology, University College, London

    G. Burnstock

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  1. K. Unsicker
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  2. G. Burnstock
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Supported by a grant from Deutsche Forschungsgemeinschaft (Un 34/3) and a Research Fellowship of the University of Melbourne to K. Unsicker. We are particularly grateful to Dr. O'Shea, Veterinary School, University of Melbourne, and Dr. Gabella, University College, London, for their criticisms of the manuscript.

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Unsicker, K., Burnstock, G. Myoid cells in the peritubular tissue (lamina propria) of the reptilian testis. Cell Tissue Res. 163, 545–560 (1975). https://doi.org/10.1007/BF00218499

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