Fibrous Layer of Follicle

The fibrous layer of follicle refers to the outermost layer of the ovarian follicle. It is composed of connective tissue and is important for providing structural support to the developing follicle. The fibrous layer is made up of several components, including the theca externa, zona pellucida, membrana granulosa, and vitelline membrane.

Theca Externa

The theca externa is a layer of connective tissue that surrounds the follicle. It is composed of fibroblasts and smooth muscle cells and provides structural support to the developing follicle. The theca externa is also important for providing blood vessels to the follicle, which are necessary for the follicle to grow and develop.

Zona Pellucida

The zona pellucida is a layer of glycoproteins that surrounds the oocyte (egg) within the follicle. It is important for protecting the oocyte and regulating its development. The zona pellucida also plays a role in fertilization, as it prevents multiple sperm from entering the oocyte.

Membrana Granulosa

The membrana granulosa is a layer of cells that surrounds the oocyte within the follicle. It is composed of granulosa cells, which are important for producing hormones that regulate the development of the follicle. The membrana granulosa also plays a role in the maturation of the oocyte, as it provides nutrients and support to the developing egg.

Vitelline Membrane

The vitelline membrane is a layer of protein that surrounds the oocyte within the follicle. It is important for protecting the oocyte and regulating its development. The vitelline membrane also plays a role in fertilization, as it prevents multiple sperm from entering the oocyte.

In conclusion, the fibrous layer of follicle is composed of several layers, including the theca externa, zona pellucida, membrana granulosa, and vitelline membrane. Each of these layers plays an important role in the development and protection of the oocyte within the ovarian follicle.

C) Membrana granulosa
the cells which are known as granulosa cells at the beginning letter get converted into corona radiata and which is the fibrous layer of the 2ndary oocyte.