The other hemisphere is the animal hemisphere . This polarity foreshadows the polarity of the embryo itself. The establishment of this polarity has been studied by monitoring the deposition of fluorescent-labeled vitellogenin. The displacement process presumably involves the cytoskeleton. The cortex resists centrifugation.
Cortical granules are membrane-enclosed organelles that release their contents at fertilization.
We shall discuss the roles of these components later. The cortical granules are formed in the endoplasm. Compare the timing of oogenesis to that of spermiogenesis. Reconstruct a mammalian follicle. Do the same for an insect egg chamber.