华支睾吸虫亚显微结构的研究 IV.卵黄细胞发育过程中的形态变化

THE SUBMICROSCOPIC STRUCTURE OF CLONORCHIS SINENSIS IV. THE DEVELOPMENT OF THE VITELLINE CELLS

华支睾吸虫卵黄腺为分散型，由许多卵黄小叶组成，每个小叶由不同发育期的卵黄细胞组成，小叶的外周有间质层包绕。营养细胞多分布于小叶外周，此种细胞具较多突起，形成网状，卵黄细胞则分布在网状结构之间。卵黄细胞又分为连续的３个发育阶段。一期（Ｓ１）为未分化的卵细胞，体积小，胞质内细胞器甚少。二期（Ｓ２）卵黄细胞系卵黄物质合成的活跃时期，细胞体积增大，胞质中有高尔基体，内质网。卵黄颗粒形成逐渐增多，聚集成团称卵黄球。三期（Ｓ３）为成熟的卵黄细胞，体积显著增大，胞质中细胞器减少或消失，但有大量糖原颗粒。据此认为卵黄细胞有双重功能，早期作为分泌细胞，成熟后具有营养细胞功能。

The vitelline gland of Clonorchis sinensis is a scatter type ,and composed of a large amount of vitelline follicles or lobules which are enveloped with interstitial layer. Each lobule contains a number of vitelline cells in various developmental stage.Nurse cells situate at the peripherty of the lobules and have many long cytoplasmic processes surrounding the developing vitelline cells. For the purpose of comparison, we divide them into three developing stages.Stage Ⅰ(S1) is an undifferentiated cells ,smaller in size with fewer cellular organs. Stage Ⅱ(S2) is active in synthesizing proteins. The cell has a greater cytoplasmic volume and contains a large number of long strands GER, Golgi complexes and mitochondria, and the vitelline granules are formed. Stage Ⅲ(S3) is the mature stage with the cell increased greatly in size and becoming filled with cluster of vitelline granules and with a large amount of glycogens and lipid droplets. Whereas ,various cellular organs reduce or disappear. The vitelline cell develops and functions first as a protein secretory cell and subsequently as a food store for the developing embryo.