The fibrous layer of the follicle:
- The fibrous layer of the follicle is one of the layers that make up the structure of an ovarian follicle.
- The ovarian follicle is the basic functional unit of the ovary and is responsible for producing and releasing eggs during the menstrual cycle.
Options:
A: Theca externa
- The theca externa is a layer of connective tissue that surrounds the ovarian follicle.
- It provides support and protection to the developing follicle.
B: Zona pellucida
- The zona pellucida is a glycoprotein layer that surrounds the oocyte (immature egg) within the ovarian follicle.
- It plays a crucial role in fertilization by allowing only one sperm to penetrate and fertilize the egg.
C: Membrana granulosa
- The membrana granulosa is a layer of granulosa cells that surround the oocyte within the ovarian follicle.
- These cells provide nourishment and support to the developing oocyte.
D: Vitelline membrane
- The vitelline membrane, also known as the zona pellucida, is a thick layer that surrounds the yolk of an egg.
- It provides protection to the yolk and helps maintain its shape.
Conclusion:
- Among the given options, the fibrous layer of the follicle is the theca externa (Option A).
- The theca externa is a fibrous layer of connective tissue that surrounds the ovarian follicle and provides support and protection.
- The other options, such as the zona pellucida, membrana granulosa, and vitelline membrane, have different functions and are not considered as the fibrous layer of the follicle.