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Related Concept Videos

Uterine Tubes01:16

Uterine Tubes

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The uterine or fallopian tubes function as the conduit through which oocytes travel from the ovaries to the uterus. Each fallopian tube measures approximately 10 to 13 cm long and is anatomically divided into the infundibulum, ampulla, isthmus, and interstitial part (or intramural segment). The infundibulum is characterized by its funnel shape and features extensions called fimbriae which reach towards the peritoneal cavity. These fimbriae play a critical role during ovulation as they extend...
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Histology of the Uterus01:19

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The uterine wall consists of three histological layers: the perimetrium, myometrium, and endometrium. The outermost perimetrium is a thin, serous membrane connected with the broad ligament on the sides, which helps anchor the uterus in the pelvic cavity. The thickest layer, myometrium, is mainly made up of smooth muscle tissue bundles. Its contractions are vital in facilitating the expulsion of the uterine lining, fetus, and placenta during menstruation and childbirth.
The endometrium is the...
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Uterus and Cervix01:18

Uterus and Cervix

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The uterus, commonly called the womb, is a vital reproductive organ in females designed to provide a nurturing environment for the implantation and growth of an embryo. It is shaped like a hollow pear and positioned between the urinary bladder and the rectum. The uterus's structure allows it to support and protect a developing fetus throughout pregnancy.
The uterus is securely anchored within the pelvic cavity by paired broad ligaments on either side. It is further stabilized by three pairs...
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Ovaries01:26

Ovaries

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The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of...
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Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

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The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
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Infertility in Females01:28

Infertility in Females

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Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
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UTERINE FIBROIDS.

Serdar E Bulun1, Ping Yin1, JianJun Wei1,2

  • 1Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois, United States.

Physiological Reviews
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

Uterine fibroids, common tumors in women, arise from smooth muscle cells and are driven by mutations in MED12 or HMGA2/1 genes. Progesterone is crucial for fibroid growth by stimulating stem cells, offering targets for medical management.

Keywords:
HMGA2MED12progesteronestem celluterine fibroid

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Area of Science:

  • Gynecology
  • Oncology
  • Cell Biology

Background:

  • Uterine fibroids (leiomyomas) are the most common tumors in women, affecting approximately 25% of reproductive-age individuals.
  • They originate from myometrial smooth muscle cells and can cause significant symptoms like heavy bleeding and pelvic discomfort.
  • Tumorigenesis is linked to somatic mutations during the myometrium's response to ovarian steroids.

Purpose of the Study:

  • To provide an overview of the mechanisms underlying uterine fibroid development and growth.
  • To explore the roles of specific genes and hormones in fibroid pathogenesis.
  • To discuss future directions for the prevention and medical management of uterine fibroids.

Main Methods:

  • Review of existing literature on uterine fibroid biology, genetics, and hormonal regulation.
  • Analysis of common somatic mutations, focusing on MED12 and HMGA2/1.
  • Examination of the role of progesterone and stem cell signaling pathways in tumor growth.

Main Results:

  • The most frequent mutations in fibroids are in MED12 (77%) and HMGA2/1 (10%).
  • MED12 mutations disrupt the Mediator complex, leading to genomic instability and increased progesterone responsiveness.
  • Progesterone is essential for fibroid growth, acting via stem cell populations through paracrine signaling.

Conclusions:

  • Uterine fibroids are complex tumors driven by genetic mutations and hormonal signaling, particularly progesterone.
  • Understanding these mechanisms is key to developing effective prevention and treatment strategies.
  • Targeting progesterone pathways and stem cell activity holds promise for future medical management.