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Information about Theca Externa

Mature late-stage tertiary (Graffian) follicle
Early folliculogenesis from primordial to early tertiary.
Latintheca folliculi
Dorlands/Elsevier t_07/12801620
The theca folliculi comprise a layer of the ovarian follicles. They appear as the follicles become tertiary follicles.

The theca are divided into two layers: theca interna and theca externa.

Theca interna

Theca interna cells express receptors for luteinizing hormone to produce androstenedione, which via a few steps, gives the granulosa the precursor for estrogen manufacturing.

After rupture of the mature ovarian follicle, the theca interna cells differentiate into the theca lutein cells of the corpus luteum. These cells secrete estradiol.

Theca externa

The theca externa is the outer layers of the theca folliculi. They contain abundant collagen and are mainly supportive.

See also

External links

 •  • [ e]
Female reproductive system
Ovaries/OogenesisGerminal epithelium • Tunica albuginea • cortex (Cumulus oophorus, Stroma) • Medulla
Follicles/Folliculogenesiscorpus (hemorrhagicum, luteum, albicans) • Theca folliculi (externa, interna) • Follicular antrum (Follicular fluid) • Corona radiata • Zona pellucida • Membrana granulosa (Granulosa cells)
LigamentsProper • Suspensory • Round • Broad (Mesovarium, Mesosalpinx, Mesometrium) • Cardinal
Fallopian tubesIsthmus • Ampulla • Infundibulum • Fimbria
Uteruscervix/neck (External orifice, Canal of the cervix, Internal orifice) • corpus/body (Cavity of the body, Fundus) • layers (Endometrium, Myometrium, Perimetrium)
VulvaMons pubis • Labium  (Labial commissures, Frenulum labiorum pudendi, Labia majora, Cleft of venus, Labia minora, Vulval vestibule, interlabial sulci) • Clitoris  (Clitoral hood , Clitoral glans, Frenulum clitoridis, Clitoral crura, Corpus cavernosa, Vestibular bulbs) • Vagina (Bartholin's glands, Bartholin's ducts, Skene's glands, Skene's ducts, Fossa of vestibule of vagina, Vaginal fornix, Hymen)
BreastMammary glands • Nipple • Areola • Lactiferous duct
OtherG-spot • Urethral sponge
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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Ovarian follicles are the basic unit of female reproductive biology, they are roughly spherical aggregations of cells found in the ovary. They contain a single oocyte (aka ovum or egg).
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Ovarian follicles are the basic unit of female reproductive biology, they are roughly spherical aggregations of cells found in the ovary. They contain a single oocyte (aka ovum or egg).
..... Click the link for more information.
The theca folliculi comprise a layer of the ovarian follicles. They appear as the follicles become tertiary follicles.

The theca are divided into two layers: theca interna and theca externa.
..... Click the link for more information.
The theca folliculi comprise a layer of the ovarian follicles. They appear as the follicles become tertiary follicles.

The theca are divided into two layers: theca interna and theca externa.
..... Click the link for more information.
The luteinizing hormone/choriogonadotropin receptor (LHCGR), also lutropin/choriogonadotropin receptor (LCGR) is a transmembrane receptor that interacts with both luteinizing hormone (LH) and chorionic gonadotropins (such as hCG in humans) and represents a G
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Luteinizing hormone (LH, also known as lutropin[1]) is a hormone synthesized and secreted by gonadotropes in the anterior lobe of the pituitary gland.
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Androstenedione (also known as 4-androstenedione) is a 19-carbon steroid hormone produced in the adrenal glands and the gonads as an intermediate step in the biochemical pathway that produces the androgen testosterone and the estrogens estrone and estradiol.
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A granulosa cell is a somatic cell found closely associated with the developing female gamete (called an oocyte or egg) in the ovary of mammals.

Anatomy and function


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Estrogens (alternative spellings: oestrogens or œstrogens) are a group of steroid compounds, named for their importance in the estrous cycle, and functioning as the primary female sex hormone.
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Ovarian follicles are the basic unit of female reproductive biology, they are roughly spherical aggregations of cells found in the ovary. They contain a single oocyte (aka ovum or egg).
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The corpus luteum (Latin for "yellow body") (plural corpora lutea) is a temporary endocrine structure in mammals, involved in the production of the progestogens which are needed for the maintenance of a pregnancy.
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The corpus luteum (Latin for "yellow body") (plural corpora lutea) is a temporary endocrine structure in mammals, involved in the production of the progestogens which are needed for the maintenance of a pregnancy.
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Estradiol (17β-estradiol) (also oestradiol) is a sex hormone. Labelled the "female" hormone but also present in males, it represents the major estrogen in humans.
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Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals, [1] making up about 25% of the total protein content.

Uses


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A theca (plural thecae) refers to any case, covering, or sheath.

In botany, the theca of an angiosperm is half of the anther. An anther and its filament form together a typical (or filantherous) stamen, part of the male floral organ.
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Boston University (BU) is a private research university located in Boston, Massachusetts, United States. Although chartered by the Massachusetts Legislature in 1869, Boston University traces its roots to the establishment of the Newbury Biblical Institute in Newbury,
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University of California, Davis, commonly known as UC Davis, is one of the ten campuses of the University of California, and was established as the University Farm in 1905.
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University of California, Davis, commonly known as UC Davis, is one of the ten campuses of the University of California, and was established as the University Farm in 1905.
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The College of Medicine at Urbana-Champaign is a graduate school at the University of Illinois at Urbana-Champaign.The UIC College of Medicine at Urbana-Champaign is located at the original campus of the University (with 42,000 students, undergraduate and graduate) and offers a
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The College of Medicine at Urbana-Champaign is a graduate school at the University of Illinois at Urbana-Champaign.The UIC College of Medicine at Urbana-Champaign is located at the original campus of the University (with 42,000 students, undergraduate and graduate) and offers a
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Yearbook = El Rodeo
Nickname Trojans
Men/Women of Troy
Mascot Traveler
Fight song Fight On
Athletics 19 varsity teams,
NCAA Division I
Affiliations AAU
Pac-10
Nobel laureates 1
Website www.usc.edu , www.usctrojans.
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Yearbook = El Rodeo
Nickname Trojans
Men/Women of Troy
Mascot Traveler
Fight song Fight On
Athletics 19 varsity teams,
NCAA Division I
Affiliations AAU
Pac-10
Nobel laureates 1
Website www.usc.edu , www.usctrojans.
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Sexual reproduction.


The human female reproductive system contains two main parts: the vagina and uterus, which act as the receptacle for the male's sperm, and the ovaries, which produce the female's ova.
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The reproductive system is the ensembles and interactions of organs and/or substances within an organism that strictly pertain to reproduction. As an example, this would include in the case of female mammals, the hormone estrogen, ova, and the uterus and the vagina, and the breasts.
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For ovary as part of plants see ovary (plants)
An ovary is an egg-producing reproductive organ found in female organisms. They are usually purple. It is often found in pairs as part of the vertebrate female reproductive system.
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Oogenesis or rarely oögenesis is the creation of an ovum (egg cell). It is the female process of gametogenesis. It involves the various stages of immature ova.

Oogenesis in mammals

In mammals, oogenesis occurs in the ovarian follicle of the ovary.
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The surface of the ovary is covered by a layer of columnar cells which constitutes the germinal epithelium of Waldeyer. (Some sources consider it simple cuboidal.[1]
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On the surface of the ovary this tissue is much condensed, and forms a layer, the tunica albuginea, composed of short connective-tissue fibers, with fusiform cells between them.
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