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Related Concept Videos

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...
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...
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...
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...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

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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Related Experiment Video

Updated: Jun 12, 2026

Culture and Co-Culture of Mouse Ovaries and Ovarian Follicles
10:41

Culture and Co-Culture of Mouse Ovaries and Ovarian Follicles

Published on: March 17, 2015

[Polyovular follicles].

K Reynaud1, S Halter, Z Tahir

  • 1UMR INRA-ENVA, biologie du développement et reproduction, Maisons-Alfort, France. kreynaud@vet-alfort.fr <kreynaud@vet-alfort.fr>

Gynecologie, Obstetrique & Fertilite
|June 26, 2010
PubMed
Summary
This summary is machine-generated.

Polyovular follicles, containing multiple oocytes, are common across species and can ovulate. They may arise from developmental imbalances or environmental exposures, impacting reproductive health.

More Related Videos

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
06:40

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Related Experiment Videos

Last Updated: Jun 12, 2026

Culture and Co-Culture of Mouse Ovaries and Ovarian Follicles
10:41

Culture and Co-Culture of Mouse Ovaries and Ovarian Follicles

Published on: March 17, 2015

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
06:40

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Area of Science:

  • Reproductive biology and developmental endocrinology.
  • Ovarian follicle development and oocyte biology.

Context:

  • Folliculogenesis describes the progression from primordial to preovulatory follicle stages.
  • While typically containing one oocyte, some follicles are polyovular, housing multiple oocytes.
  • Previously deemed pathological, polyovular follicles are now recognized as common in various species, including humans.

Purpose:

  • To explore the occurrence, formation, and characteristics of polyovular follicles.
  • To investigate the potential impact of environmental factors and genetic mutations on polyovular follicle formation.
  • To understand the ovulatory capacity of polyovular follicles.

Summary:

  • Polyovular follicles, containing multiple oocytes, occur with varying frequencies across species and with age, particularly during the prepubertal period.
  • Their formation is linked to early-stage imbalances between somatic and germ cells, leading to incomplete germ cell cyst breakdown.
  • Oocyte quality within polyovular follicles is often heterogeneous, yet these follicles can achieve ovulation.

Impact:

  • Polyovular follicles can be naturally occurring or induced by environmental agents with estrogenic activity, such as pesticides and diethylstilbestrol (DES).
  • Their presence in mutated rodents and association with environmental exposures highlight potential implications for reproductive health and toxicology.
  • Further research into polyovular follicles can enhance understanding of normal and abnormal folliculogenesis and reproductive outcomes.