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Related Concept Videos

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...
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...
Ovarian Cycle01:27

Ovarian Cycle

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 length...
Ovaries01:26

Ovaries

The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of cuboidal...
Folliculogenesis01:20

Folliculogenesis

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...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...

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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization

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Apotosis in ovary.

Xuan Jin1, Li-Juan Xiao, Xue-Sen Zhang

  • 1The First Affiliated Hospital of Nanchang University, Nanchang Jiangxi 330006, China.

Frontiers in Bioscience (Scholar Edition)
|January 4, 2011
PubMed
Summary
This summary is machine-generated.

Folliculogenesis involves cell changes regulated by hormones. Most ovarian follicles undergo apoptosis (programmed cell death) leading to follicular atresia, a key process in female reproduction.

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Area of Science:

  • Reproductive biology
  • Cellular biology
  • Endocrinology

Background:

  • Folliculogenesis involves dynamic changes in granulosa and theca cells.
  • Ovarian follicle development is tightly regulated by hormones and intra-ovarian factors.
  • Over 99% of ovarian follicles undergo atresia, a degenerative process driven by apoptosis.

Purpose of the Study:

  • To elucidate the complex mechanisms regulating folliculogenesis and follicular atresia.
  • To understand the role of apoptosis in the degenerative process of ovarian follicles.
  • To identify key hormones and cellular factors involved in granulosa cell and oocyte apoptosis.

Main Methods:

  • The study reviews existing knowledge on the hormonal and cellular regulation of folliculogenesis.
  • It examines the biochemical and morphological characteristics of apoptosis in ovarian follicles.
  • The focus is on understanding the signaling pathways involved in follicular atresia.

Main Results:

  • Folliculogenesis is a sequential process influenced by endocrine and intra-ovarian regulators.
  • Apoptosis in the ovary is characterized by DNA fragmentation, membrane blebbing, and cell shrinkage.
  • Apoptosis is regulated in a stage-specific and time-dependent manner by various mediators.

Conclusions:

  • Understanding the regulation of granulosa cell and oocyte apoptosis is crucial for comprehending follicular atresia.
  • New insights into hormone and cell factor signaling pathways advance the understanding of ovarian follicle degeneration.
  • This knowledge contributes to reproductive biology and potential therapeutic strategies for ovarian disorders.