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Related Concept Videos

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...
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...
Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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...

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Related Experiment Video

Updated: Jun 12, 2026

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

Premature ovarian failure from current perspective.

Arif Kokcu1

  • 1IVF Center, Department of Obstetrics and Gynecology, School of Medicine, University of Ondokuz Mayis, Samsun, Turkey. arifkokcu@yahoo.com

Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology
|May 27, 2010
PubMed
Summary

Premature ovarian failure (POF) affects 1% of women under 40, presenting with early amenorrhea and hypoestrogenism. While HRT is key, ovum donation is the only proven pregnancy method for POF patients.

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Fertility Preservation in Patients with Severe Ovarian Dysfunction
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Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

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Last Updated: Jun 12, 2026

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

Fertility Preservation in Patients with Severe Ovarian Dysfunction
12:03

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Area of Science:

  • Reproductive endocrinology and infertility
  • Gynecology
  • Genetics

Background:

  • Premature ovarian failure (POF) is defined as amenorrhea, hypoestrogenism, and hypergonadotropinism before age 40.
  • Affecting approximately 1% of women under 40, POF is distinct from early menopause.
  • It exhibits heterogeneity in causes, including autoimmunity, toxins, drugs, radiation, infections, and genetic defects.

Purpose of the Study:

  • To summarize the key characteristics of premature ovarian failure.
  • To highlight the varied etiology and presentation of POF.
  • To outline current management strategies and reproductive options for POF.

Main Methods:

  • Literature review of premature ovarian failure.
  • Analysis of POF prevalence and demographic data.
  • Synthesis of information on POF causes and treatment.

Main Results:

  • POF affects women under 40, with varying prevalence by age group.
  • Up to 50% of POF patients experience intermittent ovarian function.
  • Causes are diverse, encompassing autoimmune, toxic, infectious, and genetic factors.

Conclusions:

  • Hormone replacement therapy (HRT) is the primary treatment for POF symptoms.
  • Ovum donation is currently the only established method for achieving pregnancy in women with POF.