The Egg Cortex in Early Development of Sea Urchins and Starfish

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Abstract
The outer few microns of cytoplasm in eggs and embryos exert a powerful organizing influence during development. The cell cortex, as this “layer” is called, is a cellular domain whose dynamic properties account for much of the appearance and behavior of eggs and early embryos. In an abstract sense, the cortex can be considered a separate component of an egg, but in actuality it interacts with other domains such as the deeper cytoplasm and the plasma membrane. There is no distinct demarcation between the egg cortex and other parts.