Detection of Germ Cell Line in Marine Invertebrate

点击翻译按钮获取中文摘要

1. The origin of the germ cell and the early processes of the gonad formation were clarified in a octopus, Octopus ocellatus. The earlygerm cells apear in the pericardial cavity. In the female, the germ cells begin meiosis just before hatching while in the females the germ cells enter into meiosis 7 weeks after hatching.2. The origin of the germ cell and the process of sex differentiation of the gonads were elucidated in a solitary ascidian, Ciona intestinalis. The germ cells first appear in the juvenile just after metamorphosis in contact with the degenerating tissue mass which arises near the esophagus. The form a spherical body (early gonad), which divides into the testis and the ovary during migration along the wall of the stomach to the pyloric portion.3. The origin of the germ cell and the process of gonad formation became clear in a star fish, Asterina pectinifera. The germ cells, about 10 in number, originate in the third coelomic pouch of the brachyolaria larvae. The enter into the haemal system and form the gonads after metamorphosis.