The origin and nature of cortical vacuoles in the Amphioxus egg

Summary The origin and nature of cortical vacuoles have been studied in the Amphioxus egg. They originate adjacent to the plasma membrane of the growing oocyte and are finally arranged in the cortical ooplasm of the egg. The cortical vacuoles do not contain any material demonstrable with cytochemical techniques for lipids, carbohydrates, proteins, or nucleic acids. The cortical vacuoles of the Amphioxus egg are comparable to those of the fish egg.