卵母细胞
蛋黄
细胞质
脂滴
细胞生物学
高尔基体
糖原
卵黄发生
生物
卵子发生
细胞器
液泡
生物化学
内质网
胚胎
生态学
作者
Ramadan Aa,Shalaby Am,H Abdel-Ghaffar,S Abdel-Sabour
出处
期刊:PubMed
日期:1990-01-01
卷期号:38 (1): 66-73
摘要
Lipids and carbohydrates were studied in the polytrophic ovaries of Culex pipiens molestus during oogenesis. The cytoplasm of both the oocyte and the nurse cells contains lipid structures at all stages of development--granules in the early stages and spheres in the later stages. Intranuclear lipid bodies can be demonstrated in the oocyte and in the nurse cells. After leaving the nucleus, lipids are deposited in the peripheral cytoplasm. From the third to the seventh adult phase, lipid granules are concentrated in the area of the nurse cell and oocyte junction, indicating that lipids originate in the nurse cells and are transported from these to the oocyte. The follicular epithelial cells provide the oocyte with lipid material for fatty yolk synthesis and formation of the egg envelopes. Lipids are distributed similarly to the Golgi apparatus, indicating that there is a relationship between this organelle and fat formation. In the early stages, the cytoplasm of the oocyte, the nurse cells and the follicular epithelium contains glycogen granules. In the later stages these cells also contain mucopolysaccharides. The mucopolysaccharide yolk spheres are enclosed in vacuoles, while the chorion is composed of acid mucopolysaccharides. The follicular epithelium and vitelline membrane are of a mucopolysaccharide nature. A topographical relationship exists between the Golgi apparatus and the glycogen granules, indicating that this organelle also plays a role in glycogen synthesis.
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