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Ovarian Cycle01:27

Ovarian Cycle

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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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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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Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
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Oogenesis02:07

Oogenesis

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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

688
The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
688
Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

487
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...
487

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Related Experiment Video

Updated: Sep 10, 2025

Author Spotlight: Investigating the Mechanisms and Inducing Models of Polycystic Ovary Syndrome
04:49

Author Spotlight: Investigating the Mechanisms and Inducing Models of Polycystic Ovary Syndrome

Published on: July 5, 2024

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Functional and Structural Uterine Changes in PCOS.

Lucja Zaborowska1,2, Joanna Maria Blok2, Emilia Piotrkowicz2

  • 1Doctoral School of Medical and Health Sciences, Jagiellonian University Medical College, 31-008 Cracow, Poland.

International Journal of Molecular Sciences
|August 28, 2025
PubMed
Summary
This summary is machine-generated.

Polycystic ovary syndrome (PCOS) impacts uterine structure and function, potentially impairing fertility. More research is needed to understand these changes and the role of hyperandrogenism in PCOS patients.

Keywords:
animal studiespolycystic ovary syndromepregnancyuterine blood flowuterine functionuterine morphologyuterus

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A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome
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A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome

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Area of Science:

  • Reproductive endocrinology
  • Gynecology
  • Pathophysiology of PCOS

Background:

  • Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder with complex causes.
  • PCOS is linked to menstrual irregularities, androgen excess, and increased risks of metabolic and cardiovascular diseases.
  • Understanding PCOS's impact on the uterus is crucial for reproductive health.

Purpose of the Study:

  • To review structural and functional changes in the uterus associated with PCOS and hyperandrogenism.
  • To synthesize current knowledge on uterine alterations in PCOS patients, models, and pregnancy.
  • To identify gaps in research regarding the PCOS uterus.

Main Methods:

  • Comprehensive literature search of PubMed, Medline, Embase, Google Scholar, and Cochrane Library (1964-2025).
  • Inclusion of studies on the uterus in clinical PCOS, PCOS animal models, and pregnant PCOS patients.
  • Narrative review synthesizing findings on uterine blood flow, morphology, and muscle thickness.

Main Results:

  • Evidence suggests PCOS may affect uterine blood flow, morphology, and myometrial thickness.
  • Potential functional impairment of the uterus in both pregnant and non-pregnant women with PCOS.
  • Existing knowledge on uterine changes in PCOS is limited.

Conclusions:

  • PCOS and associated hyperandrogenism may lead to structural and functional uterine alterations.
  • Further research is essential to elucidate the precise impact of PCOS on uterine health.
  • Future studies should investigate the relationship between PCOS, hyperandrogenism, and uterine morphology/function.