Structure of the ovary and mode of oogenesis in a freshwater crab Potamon dehaani

Journal of Morphology
Hitoshi Ando, Toshiki Makioka

Abstract

Structure of the adult ovary and oogenetic mode were examined in the freshwater crab Potamon dehaani. An H-shaped ovary consisting of a pair of long ovarian sacs connected by a narrow bridge tube is located in the cephalothorax on the dorsal side of the stomach. A short oviduct with a seminal receptacle is connected with the posterior end of each ovarian sac, and a genital pore opens on the sternum of the sixth thoracic segment. The ovarian wall consists of a layer of ovarian epithelium that infolds to form a number of oogenetic pouches of various sizes. These are present mainly in the anterior regions of the ovarian sacs, are scarce in the posterior regions of the ovarian sacs, and are absent from the bridge tube. Each oogenetic pouch contains an egg or a relative large oocyte in its lumen. Germaria containing oogonia, very early previtellogenic oocytes, and somatic interstitial cells are located in the ovarian epithelium near the necks of the oogenetic pouches in the anterior regions of the ovarian sacs and are randomly scattered throughout the ovarian epithelium in the posterior regions of the ovarian sacs. In cross section, the germaria appear to be concentrated into a central germarial cluster in the ovarian sac. In the po...Continue Reading

References

Jan 1, 1968·Zeitschrift für Zellforschung und mikroskopische Anatomie·R G Kessel
Feb 1, 1969·The Journal of Cell Biology·G W Hinsch, M V Cone
Sep 1, 1981·Journal of Ultrastructure Research·P Talbot
Jan 1, 1997·Journal of Morphology·Kyosuke Ikuta, Toshiki Makioka
Jan 1, 1984·Journal of Morphology·Pamela I Blades-Eckelbarger, M J Youngbluth

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Citations

Oct 11, 2015·Journal of Morphology·Ana-Maria PetrescuOtilia Zarnescu

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