Theca externa

Theca externa is a layer of the ovarian follicle that is located outside the theca interna. It is composed of connective tissue and plays a crucial role in the development and function of the follicle. The term "theca" is derived from the Greek word "thēkē," which means "a case" or "a sheath."

Structure

The theca externa is the outermost layer of the ovarian follicle. It is composed of connective tissue and is rich in blood vessels. This layer provides structural support to the follicle and aids in the transport of hormones and nutrients.

Function

The primary function of the theca externa is to provide structural support to the ovarian follicle. It also plays a role in the transport of hormones and nutrients to the follicle. The theca externa, along with the theca interna, is involved in the production of the hormone androstenedione, which is a precursor to estrogen.

Clinical significance

Abnormalities in the theca externa can lead to various reproductive disorders. For example, the overproduction of androstenedione can lead to polycystic ovary syndrome (PCOS), a condition characterized by the formation of multiple cysts in the ovaries.

See also

• Ovarian follicle
• Theca interna
• Androstenedione
• Estrogen
• Polycystic ovary syndrome