Figure 3.A human primordial follicle. The oocyte with its germinal vesicle (GV) or nucleus is surrounded by a single layer of squamous granulosa cells (GC), both of which are enclosed within a basal lamina. The diameter of a human primordial follicle is ~30 µm. (Erickson GF: The Ovary: Basic Principles and Concepts. In Felig P, Baxter JD, Frohman L (eds.): Endocrinology and Metabolism. New York, McGraw-Hill, 1995. Reproduced with permission from the McGraw-Hill Companies.)