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A mature human egg is called Graffian follicle. The young ovum develops and undergoes maturity in the follicles of the ovary called Graffian fol-licles. The mature egg has a typical cell structure and consists of the following parts -
- The outermost layer is a double layered connective tissue sheet and it is differentiated into two layers namely theca externa and theca interna. The theca externa is the outer fibrous layer. It is made up of spindle shaped cells and fibres. The theca interna is composed of the inner vascular layer and it is supplied by a number of blood capillaries. In a mature follicle there is a fluid filled cavity which is eccentric and it is called antrum. The fluid itself is called liquor follicle. The antrum is lined by a membrane called granulosa there is a homogenous basement membrane called glassy membrane.
- Internal to the theca interna is a membrane called zona pellucida. This is comparable to the perivitelline membrane. Surrounding the zona pellucida is a region called corona radiata. This is formed from the other follicle cells. The cytoplasm of the egg is known as the ooplasm. The ooplasm consists of a large amount of reserve food materials.
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