cytoplasm
Beginning in puberty, each month one of the follicles and its primary oocyte starts to mature also see Figure below . The primary oocyte resumes meiosis and divides to form a secondary oocyte and a smaller cell, called a polar body. Both the secondary oocyte and polar body are haploid cells. The secondary oocyte has most of the cytoplasm from the original cell and is much larger than the polar body.