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Oogenesis

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...

Oogenesis

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 Females

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...

Hormonal Control of the Ovarian Cycle

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...

Ovarian Cycle

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...

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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Related Experiment Video

Updated: Jul 10, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

[Premature ovarian failure: present aspects].

Luiz Cesar Vilodre¹, Marcelo Moretto, Maria Beatriz da Fonte Kohek

¹Unidade de Endocrinologia Ginecológica, Serviço de Endocrinologia, Hospital de Clinicas de Porto Alegre.

Arquivos Brasileiros De Endocrinologia E Metabologia

|October 16, 2007

Summary

Premature ovarian failure (POF) affects women under 40, often with unknown causes. Management focuses on hormone therapy, infertility treatment, and preventing long-term health risks like osteoporosis.

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

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

Published on: October 25, 2024

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Last Updated: Jul 10, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction

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

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

Published on: October 25, 2024

Area of Science:

Reproductive Endocrinology
Gynecology

Context:

Premature ovarian failure (POF) affects 1:1000 women before 30, 1:250 by 35, and 1:100 by 40.
Characterized by amenorrhea, POF is not always definitive, with 5-10% experiencing spontaneous conception.
Sporadic cases constitute 95% of POF.

Purpose:

To define premature ovarian failure (POF).
To outline known etiologies and clinical management strategies for POF.

Summary:

POF is defined by gonadal failure and elevated serum follicle-stimulating hormone (FSH) levels.
Known causes include chromosomal defects, autoimmune diseases, radiation/chemotherapy, surgery, and certain drugs.
Idiopathic cases are frequent, where etiology remains unclear.

Impact:

Clinical management involves emotional support, hormone therapy (estrogen/progesterone), and infertility treatments.
Focus on preventing secondary complications such as osteoporosis and cardiovascular risks.
Highlights the importance of comprehensive care for women with POF.