WordNet

a case or sheath especially a pollen sac or moss capsule (同)sac
outer sheath of the pupa of certain insects
a nonresident doctor or medical student; connected with a hospital but not living there (同)medical extern

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《前述の名詞または文脈でそれと分かる名詞に付けて》『その』,あの,名の / 《唯一の事物に付けて》 / 《方角・自然現象に付けて》 / 《用具・楽器・特定の病気などに付けて》 / 《修飾吾[句]を伴う名詞に付けて》 / 《単数普通名詞に付けて》(1)《種族全体》…『というもの』 / 《複数名詞または集合名詞に付けて》 / 《単位》『…につき;…単位[で]』 / 《身体の一部に付けて,所有格に代わる》 / 《形容詞に付けて》 / 《固有名詞に付けて》 / 《強意用法に》『随一の』,典型的な / 《「the+比較級,the+比較級」の形で》『…すればするほどそれだけ』 / 《比較級の前に》(…につれて,のために)『それだけ』,ますます

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/08 23:42:04」(JST)

wiki en

The theca externa is the outer layer of the theca folliculi. It is derived from connective tissue, the cells resembling fibroblasts, and contains abundant collagen.^[1] During ovulation, the surge in luteinizing hormone increases cAMP which increases progesterone and PGF2α production. The PGF2α induces the contraction of the smooth muscle cells of the theca externa, increasing intrafollicular pressure. This aids in rupture of the mature oocyte, or immature oocyte at the germinal vesicle stage in the canine, along with plasmin and collagenase degradation of the follicle wall.

References

^ Sadler, T. W. (2008). Langmans embryologi (2. ed.). Copenhagen: Munksgaard Danmark. p. 33. ISBN 9788762805088.

External links

Histology image: 14805loa – Histology Learning System at Boston University
Anatomy photo: Reproductive/mammal/ovary2/ovary5 - Comparative Organology at University of California, Davis - "Mammal, canine ovary (LM, High)"
Anatomy photo: Reproductive/mammal/ovary5/ovary6 - Comparative Organology at University of California, Davis - "Mammal, bovine ovary (LM, Medium)"
UIUC Histology Subject 373 - externa
Anatomy Atlases - Microscopic Anatomy, plate 13.249
Slide at trinity.edu

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UpToDate Contents

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English Journal

Elevated expression of steroidogenesis pathway genes; CYP17, GATA6 and StAR in prenatally androgenized rats.

Jahromi MS1, Tehrani FR2, Noroozzadeh M3, Zarkesh M4, Ghasemi A5, Zadeh-Vakili A6.
Gene.Gene.2016 Nov 15;593(1):167-71. doi: 10.1016/j.gene.2016.07.067. Epub 2016 Aug 7.
It is believed that excess androgen exposure of the fetus, via altered gene expression, causes hyperandrogenism a key feature of polycystic ovary syndrome (PCOS). The aim of this study was to evaluate expression of Cytochrome P450-17 (CYP17), GATA-binding protein (GAGT6) and Steroidogenic acute regu
PMID 27511375

Differentiation of human menstrual blood-derived endometrial mesenchymal stem cells into oocyte-like cells.

Lai D1, Guo Y2, Zhang Q2, Chen Y2, Xiang C3.
Acta biochimica et biophysica Sinica.Acta Biochim Biophys Sin (Shanghai).2016 Nov;48(11):998-1005. Epub 2016 Sep 2.
Human endometrial mesenchymal stem cells (EnSCs) derived from menstrual blood are a unique stem cell source. Evidence suggests that EnSCs exhibit a multi-lineage potential and have attracted extensive attention in regenerative medicine. However, the potential of EnSCs to differentiate into germline
PMID 27590065

Comparison of the effects of human and chicken ghrelin on chicken ovarian hormone release.

Sirotkin AV1, Harrath AH2, Grossmann R3.
Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology.Comp Biochem Physiol B Biochem Mol Biol.2016 Nov;201:59-63. doi: 10.1016/j.cbpb.2016.06.011. Epub 2016 Jul 1.
The aim of the present experiments was to examine the species-specific and cell-specific effects of ghrelin on chicken ovarian hormone release. For this purpose, we compared the effects of chicken and human ghrelin on the release of estradiol (E), testosterone (T), progesterone (P) and arginine-vaso
PMID 27378405

Japanese Journal

A Potential Use of Color Ultrasound as a Tool for Reproductive Management : New Observations Using Color Ultrasound Scanning that were not Possible with Imaging Only in Black and White

MIYAMOTO Akio,SHIRASUNA Koumei,HAYASHI Ken-Go,KAMADA Daichi,KAWASHIMA Chiho,KANEKO Etsushi,ACOSTA Tomas J.,MATSUI Motozumi
The Journal of reproduction and development 52(1), 153-160, 2006-02-01
… 2) the local blood flow detected in the theca externa of mature follicles rapidly increases around the onset of LH surge and is most active before ovulation; …
NAID 130000054666

Changes in the Distribution of Tenascin and Fibronectin in the Mouse Ovary During Folliculogenesis, Atresia, Corpus Luteum Formation and Luteolysis(Reproductive Biology)

Yasuda Keiko,Hagiwara Emi,Takeuchi Akiko,Mukai Chinatsu,Matsui Chiyuki,Sakai Atsushi,Tamotsu Satoshi
Zoological science 22(2), 237-245, 2005-02-25
… In growing follicles, tenascin was only detected in the theca externa layer, while fibronectin was detected in the theca externa layer, theca interna layer and basement membrane. … In atretic follicles, tenascin was detected in the basement membrane and theca externa layer. …
NAID 110006281795