Human ovum is small and contains no yolk (Alecithal egg) It is more than 100µm in diameter At the time of ovulation, the ovum is surrounded by a striated membrane called zona radiata and later it is replaced by an unstriated membrane Zona pellucida (Primary egg membrane). The growing oocytes are surrounded by follicle cells. Some of the follicular cells of the ovary are found outside the zona pellucida and are termed as Corona radiata (Secondary egg membrane) which is peeled off when the
oocyte passes down the oviduct. The follicles and the developing oocyte together constitute Graafian follicle. The whole surface of the graafian follicle is supported by theca interna and theca externa.


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