Heacox A E, Schroeder P C
Cell Tissue Res. 1981;218(3):641-58. doi: 10.1007/BF00210121.
Oogenesis in Typosyllis pulchra begins with a short proliferative gonial phase. Gonial clusters, consisting of six to eight syncytial sibling cells, are surrounded by gonial peritoneum and are eventually liberated into the coelom. At about the same time as the onset of the coelomic phase, one gonial cell in each cluster differentiates, begins to accumulate yolk and increases in size, eventually to become a mature oocyte. Yolk is composed of lipid droplets and membrane-bound protein granules. The protein component appears to be at least partially synthesized by the oocyte. Yolk is composed of lipid droplets and membrane-bound protein granules. The protein component appears to be at least partially synthesized by the oocyte although there are some signs of endocytosis. Nurse cells and peritoneal cells are apparently able to manufacture some protein that may also be utilized by the oocyte. The nurse cells maintain cytoplasmic continuity with the oocyte, and mitochondria and ribosomes are often seen within the intercellular bridges between oocyte and nurse cell. Immediately prior to spawning, oocytes undergo prematuration and cytoplasmic reorganization. Ultrastructural changes which occur during oocyte growth and maturation are described.
美丽裂虫的卵子发生始于一个短暂的增殖性生殖细胞阶段。由六到八个合胞体姐妹细胞组成的生殖细胞团被生殖细胞腹膜包围，最终释放到体腔中。大约在体腔阶段开始的同时，每个细胞团中的一个生殖细胞分化，开始积累卵黄并增大体积，最终成为一个成熟的卵母细胞。卵黄由脂滴和膜结合蛋白颗粒组成。蛋白质成分似乎至少部分由卵母细胞合成。卵黄由脂滴和膜结合蛋白颗粒组成。尽管有一些内吞作用的迹象，但蛋白质成分似乎至少部分由卵母细胞合成。营养细胞和腹膜细胞显然能够制造一些也可能被卵母细胞利用的蛋白质。营养细胞与卵母细胞保持细胞质连续性，在卵母细胞和营养细胞之间的细胞间桥内经常可以看到线粒体和核糖体。在产卵前不久，卵母细胞经历早熟和细胞质重组。描述了卵母细胞生长和成熟过程中发生的超微结构变化。
