Department of Zoology, University of Iowa, Iowa City, Iowa, and the Marine Biological Laboratory, Woods Hole, Massachusetts.
J Cell Biol. 1965 Mar 1;24(3):471-87. doi: 10.1083/jcb.24.3.471.
Electron microscope studies were made on various tunicate oocytes at different stages of growth and development. Both the inner and outer lamellae of the perforated nuclear envelope demonstrate considerable blebbing activity. The blebs of the inner lamella detach into the nucleoplasm where they undergo a special type of fusion process resulting in the formation of numerous, usually single, differentiated annulate lamellae of various lengths. The blebbing of the outer layer of the nuclear envelope contributes to the vesicular and granular endoplasmic reticulum characteristically present in the ooplasm and perhaps to the differentiation of cytoplasmic annulate lamellae as well. Cytoplasmic stacks of annulate lamellae frequently have ribosomes associated with them. In addition, granular accumulations are sometimes observed around or between the annuli. The morphological evidence suggests that, at least in many cases, the annuli in the annulate lamellae are patent.
电子显微镜研究了不同生长和发育阶段的被囊动物卵母细胞。穿孔核膜的内、外层都表现出相当活跃的起泡活动。内层的泡脱离到核质中，在那里经历一种特殊的融合过程，导致形成许多通常是单个的、不同长度的分化的环状层。核膜外层的起泡有助于卵质中特有的小泡状和颗粒状内质网的形成，也可能有助于细胞质环状层的分化。细胞质中的环状层通常与核糖体结合。此外，还观察到环状层周围或之间有时存在颗粒堆积。形态学证据表明，至少在许多情况下，环状层中的环状层是有孔的。
