Theca

Theca refers to a sheath or a covering. In the context of biology, it is often used to describe a casing or a protective layer around an organ or a structure. The term is derived from the Greek word 'thēkē', which means 'a case' or 'a sheath'. Theca is used in various fields of biology, including botany, zoology, and anatomy.

Botany

In botany, theca refers to the part of an anther that contains pollen. It is also used to describe the casing of certain algae and fungi.

Zoology

In zoology, theca is used to describe the protective casing of certain invertebrates, such as echinoderms and cnidarians. It can also refer to the outer shell of certain protozoa.

Anatomy

In human anatomy, the term theca refers to the theca of follicle, which is a layer of cells surrounding developing ovum in the ovary. The theca of follicle is divided into two layers: the theca interna and the theca externa.

Theca Interna

The theca interna is the inner layer of the theca of follicle. It is vascularized and it secretes hormones that are important for the maturation of the ovum and the menstrual cycle.

Theca Externa

The theca externa is the outer layer of the theca of follicle. It is made up of connective tissue and it provides structural support to the follicle.

See Also

• Anther
• Ovary
• Ovum

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