Corpora

Corpus luteum

The corpus luteum is a temporary structure. It forms in the ovary after ovulationThe release of a mature oocyte from the ovary.. The corpus luteum develops from the remnants of the ovarian follicle. Histologically, it is characterized by a highly vascularizedTo invade a tissue with blood capillaries. structure. It is composed mainly of two types of lutein cellsCells in the corpus luteum that produce hormones.. These are granulosa lutein cellsThe basic structural and functional units of life. and thecaA layer of cells surrounding the follicle that produces hormones. lutein cells. Granulosa lutein cells are large and pale-staining. They are located centrally. These cells originate from the granulosa cellsCells in the follicle that support the oocyte and produce estrogen. of the follicle. They primarily produce progesteroneA hormone that supports pregnancy and regulates the menstrual cycle. and some estrogensFemale sex hormones responsible for secondary sex characteristics and regulation of the menstrual cy. Theca lutein cells are smaller and darker-staining. They are found more peripherally. These cells arise from the theca interna. They also contribute to steroid hormone production, especially androgensMale sex hormones, including testosterone and DHEA., which can be converted to estrogens.

Corpus albicans

If pregnancy does not occur, the corpus luteum degenerates into the corpus albicansA scar-like structure that forms when the corpus luteum degenerates., a fibrous scar composed largely of collagenA structural protein in the dermis that provides strength and elasticity.. However, if fertilization and implantation occur, the developing embryo releases human chorionic gonadotropin (hCG). This hormone maintains the corpus luteum. It continues secreting progesterone, which is essential for early pregnancy.