Editing 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]]

[[Category:Biology]]
[[Category:Botany]]
[[Category:Zoology]]
[[Category:Anatomy]]

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<gallery>
File:Anther01.jpg|Theca
File:Graderia_subintegra,_helmdrade,_veldblomstappie,_Faerie_Glen_NR,_a.jpg|Theca
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<gallery caption="Theca">
File:Anther01.jpg|Anther
File:Graderia subintegra, helmdrade, veldblomstappie, Faerie Glen NR, a.jpg|Graderia subintegra
</gallery>