Morphological and histochemical studies on the ovarian development and oogenesis in Paramphistomum cervi (Digenea: Paramphistomatidae)
Gupta, B.C.; Parshad, V.R.; Guraya, S.S.
Folia Parasitologica 31(2): 147-156
1984
ISSN/ISBN: 0015-5683 PMID: 6204914 Document Number: 238264
The ovary in a 4-week-old P. cervi contains undifferentiated germ cells. Oogonial differentiation, together with the appearance of some PAS-positive material in the ooplasm occurs in the ovary of 8-week-old worms. The ovary of 16-week-old worms contains only oogonia and oocytes and no germ cells. In adult worms, the oocytes reach the pachytene stage and further development is arrested at this stage. Nucleolar fragmentation and subsequent transport of nuclei to the ooplasm were observed. The ooplasm contains nutritive material rich in proteins, carbohydrates and lipids. Its amount varies with different stages of oogenesis. The localization of various phosphatases and dehydrogenases was studied during oogenesis and their functional significance discussed.