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Related Concept Videos

Oogenesis01:22

Oogenesis

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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...
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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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Folliculogenesis01:20

Folliculogenesis

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Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...
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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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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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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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Related Experiment Video

Updated: May 7, 2026

Whole Ovary Immunofluorescence, Clearing, and Multiphoton Microscopy for Quantitative 3D Analysis of the Developing Ovarian Reserve in Mouse
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Whole Ovary Immunofluorescence, Clearing, and Multiphoton Microscopy for Quantitative 3D Analysis of the Developing Ovarian Reserve in Mouse

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Oocyte development and loss.

Roger G Gosden1

  • 1Center for Reproductive Medicine and Infertility, Weill Cornell Medical College, New York, New York.

Seminars in Reproductive Medicine
|October 9, 2013
PubMed
Summary
This summary is machine-generated.

Soon after implantation, distinct cell lineages develop into somatic and germ cells. Germ cells migrate to the gonadal ridge, initiating meiosis and forming ovarian follicles, with survival and death balancing the final reserve.

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Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
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Last Updated: May 7, 2026

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Area of Science:

  • Developmental biology
  • Cell biology
  • Reproductive biology

Background:

  • Cellular differentiation begins early in embryonic development.
  • Germ cell development is crucial for reproduction.
  • Ovarian follicle development is essential for female fertility.

Purpose of the Study:

  • To describe the early development and migration of germ cells.
  • To outline the process of folliculogenesis and oocyte arrest.
  • To explain the factors influencing the ovarian follicular reserve.

Main Methods:

  • Observational study of early embryonic development.
  • Gene expression analysis of germ cell-specific markers.
  • Analysis of cell survival and death pathways.

Main Results:

  • Cell lineages bifurcate into somatic and germ cells post-implantation.
  • Germ cells migrate to the gonadal ridge and initiate meiosis.
  • Folliculogenesis involves syncytial cluster formation and diplotene arrest.
  • Ovarian reserve is determined by the balance of cell survival and death.

Conclusions:

  • Early germ cell development and migration are critical for establishing the female reproductive potential.
  • The process of folliculogenesis and oocyte arrest is tightly regulated.
  • Cellular dynamics, including survival and apoptosis, shape the ovarian follicular reserve.