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Related Concept Videos

Infertility in Females01:28

Infertility in Females

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.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Ovarian Cycle01:27

Ovarian Cycle

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 length...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

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...
Ovaries01:26

Ovaries

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 cuboidal...
Oogenesis02:07

Oogenesis

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...
Oogenesis01:22

Oogenesis

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 known...

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Related Experiment Video

Updated: May 19, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction
12:03

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

An update on primary ovarian insufficiency.

Min Jin1, YiQi Yu, HeFeng Huang

  • 1Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, 310006, China.

Science China. Life Sciences
|August 31, 2012
PubMed
Summary

Primary ovarian insufficiency (POI) affects women under 40, causing infertility and early menopause. Causes are diverse, including genetic, autoimmune, and environmental factors, often remaining unidentified.

Area of Science:

  • Reproductive Endocrinology
  • Genetics
  • Immunology

Background:

  • Primary ovarian insufficiency (POI) affects 1% of women under 40.
  • POI leads to reproductive issues, premature menopausal symptoms, and associated health complications.
  • The exact cause of most POI cases is unknown and likely multifactorial.

Purpose of the Study:

  • To review the known causes and mechanisms of primary ovarian insufficiency.
  • To discuss current management strategies and fertility preservation options for POI patients.

Main Methods:

  • Literature review of studies on primary ovarian insufficiency etiology.
  • Analysis of genetic, metabolic, autoimmune, iatrogenic, infectious, and environmental factors implicated in POI.
  • Summary of current therapeutic approaches and fertility preservation techniques.

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Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation
05:42

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation

Published on: October 25, 2024

Related Experiment Videos

Last Updated: May 19, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction
12:03

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation
05:42

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation

Published on: October 25, 2024

Main Results:

  • Identified causes of POI include chromosomal abnormalities (e.g., FMR1 premutation), gene mutations, metabolic disorders, autoimmune damage, iatrogenic factors (chemotherapy, radiotherapy, surgery), viral infections, and environmental toxins.
  • Mechanisms involve accelerated apoptosis, blocked follicular maturation, and premature follicle activation.
  • Hormone replacement and infertility treatments are key management strategies.

Conclusions:

  • POI has a complex etiology with multiple contributing factors, often unidentified.
  • Assisted reproductive technologies, such as oocyte donation, offer pregnancy options for women with POI.
  • Fertility preservation methods like oocyte and ovarian tissue cryopreservation are crucial for cancer patients.