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What are these 'follicles'? They are the oocytes and the cells surrounding them in the ovary. Drag the labels into position as you review follicle development.


















Oocytes are the resting, immature egg cells


which develops a clear protective layer, the zona pellucida
surrounded by granulosa cells
a new layer of protective cells, the thecal cells, are stimulated by LH to produce androgens and help attract blood vessels to support the developing follicle.

the granulosa cells convert the androgens to estrogen. They also develop many FSH receptors.
when stimulated by FSH, the follicle enlarges around the oocyte




When you're done, click the forward arrow on the right to go on.