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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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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.
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Infertility in Females01:28

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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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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...
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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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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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[Premature ovarian failure].

Carmen Regina Leal de Assumpção1

  • 1Instituto Estadual de Diabetes e Endocrinologia Luiz Capriglione, Universidade do Estado do Rio de Janeiro.

Arquivos Brasileiros De Endocrinologia E Metabologia
|May 17, 2014
PubMed
Summary

Premature ovarian failure (POF) affects women under 40, causing hypogonadism. Infertility is a major challenge, impacting quality of life and reproductive health.

Area of Science:

  • Reproductive Endocrinology
  • Gynecology

Background:

  • Premature ovarian failure (POF) is characterized by hypogonadism in women under 40.
  • It presents significant challenges, particularly infertility.

Purpose of the Study:

  • To provide a comprehensive review of premature ovarian failure (POF).
  • To discuss etiopathogeny, causes, clinical aspects, diagnosis, and treatment.

Main Methods:

  • Literature review of premature ovarian failure (POF).

Main Results:

  • Etiopathogeny, autoimmune and iatrogenic causes, and X chromosome abnormalities are key factors in POF.
  • Clinical manifestations, diagnosis, and treatment options are explored.

Conclusions:

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  • POF diagnosis is often associated with infertility, posing the most significant problem for affected women.
  • Understanding POF's multifaceted nature is crucial for effective management.