Abstract
Abstract In Discoglossus oocytes, annulate lamellae (AL) are generated during vitellogenesis by blebbing of the outer nuclear membrane and, in the case of previtellogenic oocytes, probably also from the smooth endoplasmic reticulum (ER). AL give rise to rough ER (RER) in both previtellogenic and vitellogenic oocytes. During the lamella-cisterna transition, in vitellogenic oocytes, a discrete mass of material having the same morphological characteristics as the interlamellar matrix is found next to the transforming AL. This might be evidence of a release of material from AL during transformation into RER.
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