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Hydra: Eine Anatomisch-Entwicklungsgeschichtliche Untersuchung (Classic Reprint): Eine Anatomisch-Entwicklungsgeschichtliche Untersuchung (Classic Reprint)

Hydra: Eine Anatomisch-Entwicklungsgeschichtliche Untersuchung (Classic Reprint): Eine Anatomisch-Entwicklungsgeschichtliche Untersuchung (Classic Reprint)

          
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About the Book

Excerpt from Hydra: Eine Anatomisch-Entwicklungsgeschichtliche Untersuchung

Die Hohlräume des Hydrakörpers die Leibeshöhle, an Welcher man gewohnlich die Stielhöhle und den sogenannten Magen unterscheidet, und die mit dem letztem com municirenden Canäle der Tentakeln sind überall mit einem einschichtigen Epithel aus gekleidet Dies besteht aus fest an einander haftenden, kernhaltigen, membranlosen Zellen, welche in den verschiedenen Regionen des Körpers in Bau und Function einige nicht unbedeu tende Unterschiede darbieten. Ihre Form wechselt natürlich je nach dem Zustande des über all leicht beweglichen Körpers. Befindet sich das Thier ausgedehnt in Ruhe, so bildet das Entoderm des freien Endes der Tentakeln eine gleichmässige dünne Schicht, in welcher oft weder die Zellgrenzen noch die Kerne wahrnehmbar sind; gegen das angeheftete Ende-zu lassen sich die einzelnen Zellen immer deutlich erkennen, da sie sich nur im Umfange der breiten Basis, mit welcher sie der Muskellamelle aufsitzen, berühren, während ihre freie Fläche halbkriglig in die Höhle hineinragt: der Canal erscheint dadurch im optischen Längsschnitt regelmässig eingeschnürt und im Querschnitt sternförmig. Die Auskleidung des oralen Theils der Leibeshöhle wird dagegen von dicht gedrängt stehenden, prismatischen Zellen gebildet, deren Höhe immer und zuweilen bis auf das sechsfache grosser ist, als ihr Durchmesser (taf. 1. Fig. Im Fuss sind die Zellen wieder niedriger und breiter, ähnlich denen der Basis der Tentakeln (taf. I. Fig. Diese beiden Regionen gehen entweder allmählich in einander über, so stets bei H. Viridis, oder die Form der' Zellen ändert sich ganz plötzlich, wie bei Wohlgenährten Exemplaren von H. Aurantiaca und grisea und dadurch erscheint auch äusserlich eine sehr scharfe Abgrenzung von Fuss und Magen.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9780656982929
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Language: German
  • ISBN-10: 0656982926
  • Publisher Date: 12 Nov 2018
  • Binding: Hardback
  • Returnable: N


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