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Related Concept Videos

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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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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Oogenesis01:22

Oogenesis

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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is...
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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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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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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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Related Experiment Video

Updated: Oct 30, 2025

Alginate Hydrogels for Three-Dimensional Organ Culture of Ovaries and Oviducts
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Alginate Hydrogels for Three-Dimensional Organ Culture of Ovaries and Oviducts

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The Crazy Ovary.

Philippe Monget1, Ken McNatty2, Danielle Monniaux1

  • 1UMR INRAE-CNRS-IFCE-Université de Tours, 37380 Nouzilly, France.

Genes
|July 2, 2021
PubMed
Summary
This summary is machine-generated.

The ovary constantly changes throughout life, with the oocyte acting as a key organizer. Premature oocyte loss disrupts ovarian function and can lead to various pathologies.

Keywords:
crazyfolliculogenesisovaryovulation rateprimordial folliclesreactivationsteroidogenesisunexpected

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Area of Science:

  • Reproductive Biology
  • Ovarian Physiology
  • Developmental Biology

Background:

  • The ovary undergoes continuous structural and functional transformations from fetal development to senescence.
  • Ovarian processes include follicular formation, growth, atresia, steroidogenesis, oocyte maturation, ovulation, and corpus luteum function.

Purpose of the Study:

  • To review complex and previously unknown ovarian processes.
  • To provide insights into follicular growth initiation, pathologies, and the roles of specific genes.

Main Methods:

  • Analysis of in vitro and in vivo studies.
  • Examination of natural genetic mutations.
  • Investigation of experimental gene inactivation.

Main Results:

  • The oocyte is identified as a critical organizer of ovarian function.
  • Oocytes influence somatic cell phenotype, follicular development, and ovulation rate.
  • Premature germ cell or oocyte loss leads to ovarian disorganization and pathologies.

Conclusions:

  • The oocyte plays a central role in maintaining normal ovarian function.
  • Disruption of oocyte integrity results in significant ovarian pathologies.
  • Understanding these processes is crucial for reproductive health.