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Related Concept Videos

Menopause01:28

Menopause

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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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Oogenesis02:07

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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Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

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The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
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Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian 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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Signs of Puberty01:27

Signs of Puberty

375
Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
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Ovarian Cycle01:27

Ovarian Cycle

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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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Related Experiment Video

Updated: Jul 12, 2025

Author Spotlight: Investigating the Relationship Between FSH and Pathophysiological Changes in Perimenopausal Women - Insights from a Mouse Model
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Do mammals have menopause?

Ivana Winkler1, Angela Goncalves1

  • 1German Cancer Research Center (DKFZ), Somatic Evolution and Early Detection, 69120 Heidelberg, Germany.

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|October 27, 2023
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Summary
This summary is machine-generated.

Menopause, the permanent cessation of ovulation, is common in mammals, not just humans. This study redefines menopause for better cross-species comparison and understanding of reproductive aging in animals.

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Area of Science:

  • Reproductive biology
  • Comparative endocrinology
  • Mammalian reproduction

Background:

  • Understanding of menopause in non-human mammals is limited by semantic issues and data scarcity.
  • The traditional definition of menopause based on the last menstrual bleed is inadequate for cross-species comparisons.
  • A clear, universally applicable definition is needed to study reproductive aging across diverse mammalian species.

Purpose of the Study:

  • To redefine menopause in a way that facilitates cross-species comparisons in mammals.
  • To investigate the prevalence of menopause across different mammalian orders.
  • To advance the study of reproductive senescence and its evolutionary implications.

Main Methods:

  • Literature review and synthesis of existing data on mammalian reproductive cycles.
  • Analysis of reproductive patterns across various mammalian orders to identify cessation of ovulation.
  • Development of a revised definition of menopause based on persistent anovulation.

Main Results:

  • Menopause, defined as the permanent cessation of ovulation, is not unique to humans.
  • Evidence suggests menopause is widespread across multiple mammalian orders.
  • The revised definition allows for a broader understanding of reproductive aging in the animal kingdom.

Conclusions:

  • The permanent cessation of ovulation is a more accurate and inclusive definition of menopause for comparative studies.
  • Menopause is a common reproductive strategy across diverse mammalian species.
  • This redefinition opens new avenues for research into the evolution and ecological impact of menopause.