扩张莫尼茨绦虫(绦虫纲:圆叶目)卵黄细胞发育的超微结构

用透射电镜观察了扩张莫尼茨绦虫(Moniezia expansa)卵黄细胞发育的全过程。扩张莫尼茨绦虫卵黄细胞发育的规律为：(1)细胞体积不断增大；(2)质、核比不断增加而核体积几乎不发生改变，核表面从规则变为不规则，再由不规则变为规则，核内出现染色质浓缩成小块再分散的发育变化过程；(3)线粒体逐渐增多，发育不断完善；(4)粗面内质网及高尔基复合体出现由少到多，发育不断完善，再由多到少不断退化的变化；(5)由高尔基复合体组装的电子致密的小卵黄囊不断融合，至卵黄细胞成熟时仅有一卵黄囊，占据细胞大部分体积动物学报49(2)：256—261，2003]。

Ultrastructure of vitellogenesis in cestode (Moniezia expansa) (Cestoda: Cyclophyllidea)

Transmission electron microscopic observations have been made on vite llogenesis in the cestode, Moniezia expansa. Four continuous developmental sta ges were evident: (1) an immature gonial stage prior to differentiation; (2) an early stage of differentiation; (3) an advanced stage of differentiation; and (4 ) the mature vitellocyte. Mature vitelline follicles consist of cells in variou s stages of development, distributed irregularly. Maturation of the vitellocyte is completed before the cell leaves the follicle. The process of maturation is c haracterized by: (1) a gradual increase in cytoplasm/nucleus ratio and cell volu me; (2) the presence of large numbers of mitochondria; (3) the appearance of gra nular endoplasmic reticulum and associated Golgi apparatus; (4) the production a t the Golgi of small electron dense vitelline vesicles that fuse and eventually amalgamate into one large vitelline vesicle, filling most of the cell volume.