Die Oocyten der Grundel Pomatoschistus minutus.
| Autor: | Riehl, R. |
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| Zdroj: | Helgoländer Wissenschaftliche Meeresuntersuchungen; 1978, Vol. 31 Issue 3, p314-332, 19p |
| Abstrakt: | The egg membrane and follicle of the oocytes of Pomatoschistus minutus were investigated by light and electron microscopy. The formation of the cortex radiatus begins in late stage I and is concluded in stage III. In stage II bundle structures appear at the base of the cortex radiatus. These bundle structures cannot be identified in stage III. The cortex radiatus differentiates into the cortex radiatus externus and the cortex radiatus internus. Up to 220 attaching filaments originate in stage II. They are connected with the egg membrane at the animal pole. The attaching filaments are a modified part of the cortex radiatus externus. They consist of two substances which differ in their electron density. The attaching filaments lie between the cells of the follicle epithelium and are probably formed by these cells. They are adapted for attaching the eggs. The follicle epithelium is always single-layered. The cross-section of the spindle-shaped follicle cells is quadratic in stage I and II and quadrilateral in stage III. The cells of the follicle epithelium contain a lot of rough ER and are thus divided into many compartments. The primary oocyte membrane (oolemma) shows considerable pinocytosis activity in stage II and there are many polysomes in the peripheral cytoplasm. Possible functions of the pinocytotic vesicles and the polysomes are discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: | Complementary Index |
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