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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...
Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

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...
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...
Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

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Evaluation of Hepatic Glucose Production in a Polycystic Ovary Syndrome Mouse Model
09:44

Evaluation of Hepatic Glucose Production in a Polycystic Ovary Syndrome Mouse Model

Published on: March 5, 2022

Polycystic ovary syndrome.

Robert J Norman1, Didier Dewailly, Richard S Legro

  • 1Research Centre for Reproductive Health, School of Paediatrics and Reproductive Health, University of Adelaide, Adelaide, South Australia, Australia.

Lancet (London, England)
|August 28, 2007
PubMed
Summary

Polycystic ovary syndrome (PCOS) is a common endocrine disorder in women, characterized by hormonal imbalances and potential health issues like infertility and metabolic syndrome. Research explores its complex causes, including genetics and environmental factors.

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Area of Science:

  • Endocrinology
  • Reproductive Health
  • Metabolic Disorders

Background:

  • Polycystic ovary syndrome (PCOS) affects approximately 1 in 15 women globally.
  • It is a heterogeneous endocrine disorder primarily involving excessive androgen secretion or activity and often abnormal insulin activity.
  • PCOS leads to various health complications, including menstrual dysfunction, infertility, hirsutism, acne, obesity, and metabolic syndrome.

Purpose of the Study:

  • To summarize the key features and diagnostic criteria of Polycystic Ovary Syndrome (PCOS).
  • To highlight the associated health risks and complications of PCOS.
  • To discuss the current understanding of PCOS etiology, including genetic and environmental influences.

Main Methods:

  • Review of existing literature on Polycystic Ovary Syndrome (PCOS).
  • Analysis of diagnostic criteria including hyperandrogenism, chronic anovulation, and polycystic ovaries.
  • Examination of epidemiological data and etiological studies.

Main Results:

  • PCOS is characterized by hyperandrogenism, chronic anovulation, and polycystic ovaries, though definitions remain debated.
  • Women with PCOS have increased risks for type 2 diabetes and potentially cardiovascular disease.
  • The exact cause of PCOS is unknown, but likely involves a combination of genetic predisposition and environmental factors during gestation and life.

Conclusions:

  • Polycystic Ovary Syndrome (PCOS) is a complex endocrine disorder with significant health implications.
  • While diagnostic criteria exist, their precise definition and relative importance are still under discussion.
  • Understanding the interplay of genetic and environmental factors is crucial for future research and management of PCOS.