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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...
Meiosis II01:57

Meiosis II

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 containing...

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Related Experiment Video

Updated: May 30, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

[New possibilities resulting from oocyte banking].

Ariel Revel1, Michel Revel, Neri Laufer

  • 1Department of Obstetrics and Gynecology, Hadassah Hebrew University. arielr2@hadassah.org.il

Harefuah
|August 2, 2011
PubMed
Summary

Oocyte cryopreservation offers solutions for embryo cryopreservation issues and extends reproductive options for women facing infertility or medical treatments. This technology allows for postponed childbirth and provides alternatives for various fertility challenges.

Related Experiment Videos

Last Updated: May 30, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Area of Science:

  • Reproductive medicine and cryobiology.
  • Human embryology and assisted reproductive technologies.

Context:

  • Oocyte cryopreservation addresses ethical and legal concerns linked to embryo cryopreservation in in vitro fertilization (IVF).
  • It provides fertility preservation for young women with malignant diseases undergoing treatments that may impact ovarian reserve.
  • Offers alternatives for patients with ovarian hyper-stimulation syndrome, premature ovarian failure, or those needing oocyte donation.

Purpose:

  • To review the advancements in oocyte vitrification technology.
  • To discuss the ethical considerations surrounding oocyte banking.
  • To analyze the advantages and disadvantages of oocyte banking and its societal implications.

Summary:

  • Oocyte cryopreservation circumvents legal/ethical issues of embryo freezing and extends reproductive potential.
  • It enables fertility preservation for cancer patients and offers solutions for various infertility conditions.
  • Oocyte banking avoids cycle synchronization and surplus embryo creation, allowing for postponed childbirth.

Impact:

  • Vitrification has revolutionized oocyte cryopreservation, making it a more viable option.
  • Oocyte banking presents new societal possibilities regarding family planning and reproductive autonomy.
  • Ethical debates continue regarding access, implications, and the potential for widespread use.