Read e-book online Early Development of the Adrenal Glands in the Grass Snake PDF

By Weronika Rupik (auth.)

ISBN-10: 3540431659

ISBN-13: 9783540431657

ISBN-10: 3642559778

ISBN-13: 9783642559778

Knowledge of the improvement and differentiation of adrenal glands in reptile embryos is fragmentary and faulty. Many contradictions and an absence of electron microscopical research of reptile adrenal primordia make it tricky to match the gland improvement to different vertebrate teams. inadequate wisdom permits us to just shape hypotheses as to the differentiation of reptile adrenals, resulting in definite generalisations at the evolutionary improvement of this organ in vertebrates. therefore, there are nonetheless many questions worthy answering. up to now, the genesis of interrenal tissues has now not been clarified. The query of the instant of differentiation of 2 tissues continues to be open, as does that in their mutual topographic dating in the course of the improvement of adrenal glands in just about all reptile species. additionally, the time of the beginning of catecholamine synthesis in chromaffin tissue cells has no longer but been outlined. We additionally don't know while the adrenal cells in reptiles depart the embryonic degree and input a whole task interval. The reader will locate solutions to a few of the above questions within the current volume.

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Additional resources for Early Development of the Adrenal Glands in the Grass Snake Natrix natrix L. (Lepidosauria, Serpentes)

Sample text

Individuals do not show distinct dimorphic differences which would make identification of males and females easy and accurate, especially in young and medium-length specimens. Dobrowolska (1990) has reported two mating seasons in this species: early spring and summer. It also seems possible that there is only one prolonged mating season beginning in early spring and finishing in late autumn (Frommhold 1959). When late mating occurs, fertilized females hibernate and lay eggs after emerging in spring (Juszczyk 1987).

Arrowsindicate interrenal tissue primordia, arrowheads indicate conden sation of chromaffinoblasts. A, aorta dorsalis; G, gonads primordia; Me, Malpighi corpuscle; Mes, mesonephros. H&E,xi 00 Fig. 23. A transverse section of the mesonephros and interrenal tissue primordia of an embryo at developmental stage V. Arrowheads indicate interrenal tissue primordia. A, aorta dorsalis; Mes, mesonephros. H&E, x200 37 At the beginning of developmental stage VI, interrenal primordia take the form of elongated cones.

23). 36 Fig. A transverse section of an embryo at developmental stage V. Arrowsindicate interrenal tissue primordia, arrowheads indicate conden sation of chromaffinoblasts. A, aorta dorsalis; G, gonads primordia; Me, Malpighi corpuscle; Mes, mesonephros. H&E,xi 00 Fig. 23. A transverse section of the mesonephros and interrenal tissue primordia of an embryo at developmental stage V. Arrowheads indicate interrenal tissue primordia. A, aorta dorsalis; Mes, mesonephros. H&E, x200 37 At the beginning of developmental stage VI, interrenal primordia take the form of elongated cones.

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Early Development of the Adrenal Glands in the Grass Snake Natrix natrix L. (Lepidosauria, Serpentes) by Weronika Rupik (auth.)


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