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Related Concept Videos

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 Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

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 release.
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...
Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...
Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...

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Related Experiment Video

Updated: Jul 5, 2026

Blood Sampling and Hormone Measurement for Determining the Stage in the Ovarian Cycle in Marmosets
06:17

Blood Sampling and Hormone Measurement for Determining the Stage in the Ovarian Cycle in Marmosets

Published on: July 5, 2024

Menopause in nonhuman primates?

Margaret L Walker1, James G Herndon

  • 1Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30322, USA. mlwalke@emory.edu

Biology of Reproduction
|May 23, 2008
PubMed
Summary
This summary is machine-generated.

Female reproductive aging leads to menopause, marked by ovulation cessation. Research suggests menopause is not unique to humans, occurring in various primate species.

More Related Videos

Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model
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Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model

Published on: August 11, 2023

Related Experiment Videos

Last Updated: Jul 5, 2026

Blood Sampling and Hormone Measurement for Determining the Stage in the Ovarian Cycle in Marmosets
06:17

Blood Sampling and Hormone Measurement for Determining the Stage in the Ovarian Cycle in Marmosets

Published on: July 5, 2024

Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model
05:32

Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model

Published on: August 11, 2023

Area of Science:

  • Reproductive biology
  • Primatology
  • Gerontology

Background:

  • Female aging involves gradual reproductive and fertility decline, culminating in menopause.
  • Menopause, characterized by the cessation of ovulation, signifies the end of reproductive capacity in humans.

Purpose of the Study:

  • To review controversies surrounding menopause in nonhuman primates.
  • To determine if nonhuman primates are suitable models for human reproductive senescence.

Main Methods:

  • Review of existing research on reproductive aging in nonhuman primates.
  • Analysis of data concerning definition, timing, and population comparability (wild vs. captive).
  • Cross-species comparisons of reproductive senescence.

Main Results:

  • Existing data indicate menopause occurs in several primate species.
  • Menopause is not a phenomenon exclusive to humans.

Conclusions:

  • Nonhuman primates exhibit menopause, challenging the notion of its human exclusivity.
  • Further research is needed to clarify the suitability of nonhuman primates as models for human reproductive aging.