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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...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
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...
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: May 24, 2026

A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome
08:20

A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome

Published on: October 2, 2018

[Post-menopausal ovarian hyperthecosis].

A-L Castell1, S Hieronimus, A Chevallier

  • 1Service d'endocrinologie, gynécologie et reproduction, hôpital l'Archet, CHU de Nice, 151 route de Saint-Antoine-Ginestière, Nice, France.

Gynecologie, Obstetrique & Fertilite
|February 17, 2012
PubMed
Summary
This summary is machine-generated.

Ovarian hyperthecosis is a rare cause of post-menopausal hyperandrogenia. Surgical removal of ovaries confirmed the condition and stopped excess androgen production.

Related Experiment Videos

Last Updated: May 24, 2026

A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome
08:20

A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome

Published on: October 2, 2018

Area of Science:

  • Endocrinology
  • Gynecology
  • Reproductive Medicine

Background:

  • Ovarian hyperthecosis is an infrequent cause of post-menopausal hyperandrogenia.
  • Its pathophysiology is poorly understood, but insulin resistance and elevated luteinizing hormone (LH) may play a role, similar to polycystic ovarian syndrome.

Observation:

  • Four post-menopausal patients presented with hyperandrogenia.
  • High testosterone levels, enlarged ovaries without focal lesions, and metabolic syndrome suggested ovarian hyperthecosis.
  • Bilateral annexectomy was performed for diagnosis and treatment.

Findings:

  • Histological examination confirmed ovarian hyperthecosis, characterized by specific luteinized stromal cells.
  • The surgical intervention led to the complete cessation of inappropriate androgen secretion.

Implications:

  • This case series highlights the importance of considering ovarian hyperthecosis in post-menopausal women with hyperandrogenia.
  • Surgical management can effectively resolve androgen excess in these patients.
  • Further research into the pathophysiology of ovarian hyperthecosis is warranted.