Differentiation of chromaffin cells in the developing adrenal gland of Testudo hermanni

Anatomy and Embryology
F AccordiRocco Liguori

Abstract

The aim of this study was to investigate the development and differentiation of chromaffin cells in the adrenal gland of the turtle Testudo hermanni during ontogenesis using histological, immunocytochemical and ultrastructural methods. The 26 developmental stages were divided into three periods: in the early period (stages 1-18, up to 20 days of incubation at 37 degrees Celsius and 85% humidity), the chromaffin cells were observed from stage 12. They followed a ventro-lateral migration pathway with respect to the notochord and dorsal aorta, forming groups embedded in undifferentiated mesenchymal tissue. They reached the kidney surface only at the end of this period. Under the EM the chromaffin cells showed typical embryonic characters, such as rounded shape, high nucleus/plasmatic ratio, cell membrane with elongated processes; the cytoplasm contained a large number of free ribosomes, Golgi complexes, RER and a few chromaffin granules distributed in small sets. The granules were small and displayed a high electrondensity. Numerous unmyelinated fibres ran close to the chromaffin cells. At the end of this period both nervous elements and chromaffin cells were positive to the antigen for DbetaH. The intermediate period (stages 19-2...Continue Reading

References

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Sep 1, 1986·Journal of Morphology·Elena Grassi Milano, Fiorenza Accordi

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Citations

Dec 8, 2010·Anatomia, histologia, embryologia·C Chimenti, F Accordi
Sep 12, 2006·The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology·Enrico CrivellatoValentina Patrizia Gallo

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