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Related Concept Videos

Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Spermatogenesis01:41

Spermatogenesis

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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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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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Sperm Transport01:15

Sperm Transport

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
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Meiosis II01:57

Meiosis II

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis II02:02

Meiosis II

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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Related Experiment Video

Updated: Nov 28, 2025

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
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Where do human sperm and egg meet?

Liselot J W Thunnissen1, Cindy G J Cleypool2, Bernadette S de Bakker1

  • 1Department of Medical Biology, Section Clinical Anatomy & Embryology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.

Reproduction (Cambridge, England)
|December 1, 2020
PubMed
Summary

Human fertilization may occur in the peritoneal cavity, not just the fallopian tube. This review explores alternative fertilization sites and their impact on reproductive medicine.

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Last Updated: Nov 28, 2025

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
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Area of Science:

  • Reproductive Biology
  • Human Embryology

Background:

  • The ampulla of the fallopian tube is the conventionally accepted site of human fertilization.
  • Emerging evidence suggests the peritoneal cavity may also serve as a site for human fertilization.

Purpose of the Study:

  • To review existing studies on human fertilization sites.
  • To discuss new insights into alternative fertilization locations.
  • To explore the implications for reproductive medicine.

Main Methods:

  • Literature review of studies on human fertilization sites.
  • Analysis of evidence supporting both fallopian tube and peritoneal cavity fertilization.
  • Discussion of current understanding and future research directions.

Main Results:

  • Evidence supports the ampulla of the fallopian tube as a primary fertilization site.
  • The peritoneal cavity presents a potential alternative site for human fertilization.
  • The review synthesizes findings on the biological plausibility and observed instances of extra-tubal fertilization.

Conclusions:

  • The site of human fertilization may be more varied than previously assumed.
  • Understanding alternative fertilization sites is crucial for advancing reproductive technologies.
  • Further research is warranted to fully elucidate the role of the peritoneal cavity in human conception.