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Related Concept Videos

Spermatogenesis01:22

Spermatogenesis

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Spermatogenesis01:41

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Menopause01:28

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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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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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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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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
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Related Experiment Video

Updated: Nov 17, 2025

Serial Enrichment of Spermatogonial Stem and Progenitor Cells SSCs in Culture for Derivation of Long-term Adult Mouse SSC Lines
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Healthy ageing and spermatogenesis.

Eva Pohl1, Jörg Gromoll2, Joachim Wistuba2

  • 1Institute of Human Reproductive Genetics, University of Münster, Münster, Germany.

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|February 12, 2021
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Summary

Healthy male aging does not impair testicular function. Specific molecular changes occur in aging germ cells, distinct from somatic aging, offering insights into pure age effects on male fertility.

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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Area of Science:

  • Reproductive biology
  • Gerontology
  • Spermatogenesis

Background:

  • Delayed family planning and increased parental age are linked to infertility and offspring health issues.
  • While female aging's impact on oogenesis is known, male aging's effects on spermatogenesis are less understood.
  • Differentiating 'pure' aging effects from morbidities in male germline aging is challenging.

Purpose of the Study:

  • To review current knowledge on healthy aging and spermatogenesis.
  • To distinguish intrinsic age-dependent changes in male germ cells from somatic aging.
  • To establish a baseline for studying age effects separate from infertility or comorbidities.

Main Methods:

  • Review of existing literature on male aging and spermatogenesis.
  • Analysis of molecular signatures in aging sperm and germ cells.
  • Examination of spermatogonial stem cell populations and their niche.

Main Results:

  • Healthy aging does not necessarily deteriorate testicular hormone production or spermatogenic output.
  • Intrinsic, age-dependent molecular changes occur in germ cells, distinct from somatic aging.
  • Evidence of stem cell exhaustion compensation, stem cell niche alterations, and molecular aging signatures (DNA fragmentation, methylation, telomere length) in aging fertile men's sperm.

Conclusions:

  • Intrinsic molecular changes in aging male germ cells are distinct from somatic aging.
  • Re-activation of quiescent spermatogonia may link to molecular changes in aged sperm.
  • A baseline of 'pure' age effects in male germ cells can be identified for future research.