Theca
Theca
Theca (pronunciation: thee-ka) is a term used in various fields of biology and medicine.
Etymology
The term 'theca' is derived from the Greek word 'θήκη', which means 'a case' or 'a sheath'.
Definition
In the context of biology and medicine, theca refers to a sheath or a case that encloses a part of the body or an organ. It is often used to describe specific structures in plants and animals.
Usage in Different Fields
In Botany
In botany, theca refers to the part of the anther in flowering plants where pollen is produced and stored. Each anther typically contains two thecae.
In Zoology
In zoology, the term theca is used to describe a variety of hard or chitinous protective cases or shells. For example, in echinoderms like sea urchins, the theca is the main body, excluding the arms or spines.
In Medicine
In medicine, theca often refers to the theca of follicle, a layer of cells surrounding developing ovum in the ovary. The theca cells play a crucial role in the production of hormones necessary for the maturation of the ovum.
Related Terms
- Theca Lutein Cyst: A type of functional ovarian cyst that can occur in cases of high levels of human chorionic gonadotropin.
- Theca Cell: A type of cell found in the ovary that plays a role in the production of hormones.
- Theca Interna and Theca Externa: The two layers of theca cells in the ovary.
External links
- Medical encyclopedia article on Theca
- Wikipedia's article - Theca
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