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関連する概念動画

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...
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...
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...
Folliculogenesis01:20

Folliculogenesis

Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...

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関連する実験動画

Updated: Jun 10, 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

プライマリ卵巣不全 (Primary Ovarian Insufficiency) とは,卵巣の不全が発症している場合です.

Michel De Vos1, Paul Devroey, Bart C J M Fauser

  • 1Centre for Reproductive Medicine, UZ Brussel, Brussels, Belgium. mdevos@uzbrussel.be

Lancet (London, England)
|August 17, 2010
PubMed
まとめ
この要約は機械生成です。

一次性卵巣不全 (POI) は,卵巣の原因による卵巣機能不全であり,しばしば早めの卵泡枯渇につながる. 診断には,FSHが上昇し,エストラディオールが低下し,生殖健康と生育能力に影響を及ぼすことが含まれます.

さらに関連する動画

Fertility Preservation in Patients with Severe Ovarian Dysfunction
12:03

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

関連する実験動画

Last Updated: Jun 10, 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

科学分野:

  • 生殖内分泌学 生殖内分泌学
  • 遺伝学 遺伝学とは
  • 腫瘍学 腫瘍学

背景:

  • 一次性卵巣不全 (POI) は,卵巣が正常に機能できない状態で特徴づけられる状態です.
  • それはしばしば未知のメカニズムによる卵巣の卵泡の準備の早すぎる枯渇の結果である.
  • 原因には遺伝的要因,化学療法や放射線療法などの治療法,外科的介入などが含まれる.

研究 の 目的:

  • 主要卵巣不全 (POI) とその根本的な原因を定義する.
  • POIの診断基準を概説する.
  • POIの生殖および長期的な健康への影響を議論する.

主な方法:

  • 原発性卵巣不全に関する既存の文献のレビュー.
  • 卵泡刺激ホルモン (FSH) とエストラディオールレベルを含む診断マーカーの分析.
  • POIが生育能力と女性全体の健康に与える影響の検討.

主要な成果:

  • POIは,月経周期の欠落によって診断され,血清のFSHが上昇し,エストラジオールが減少すると確認されます.
  • この状態はしばしば不妊症につながり,特に若い個体において生殖健康に重大な影響を及ぼします.
  • 長期的なエストロゲン欠乏症は,骨密度,心血管健康,神経機能,および一般的な健康にリスクをもたらす.

結論:

  • 原発性卵巣不全は,生殖能力に深刻な影響を与えるため,慎重に診断と管理する必要があります.
  • がん患者,POIの家族歴のある患者など,リスクのある個人に生育保存の選択肢を考慮する必要があります.
  • エストロゲン欠乏による長期的な健康への影響に対処することは,POI患者の管理に不可欠です.