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Related Concept Videos

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...
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...
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...
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...
Functions of Life01:23

Functions of Life

Human life is characterized by a variety of functions that are essential for survival and well-being. These functions include metabolism, movement, development, growth and reproduction.
Metabolism
The basic function of an organism is to consume energy and molecules in foods, convert some of it into fuel for movement, sustain body functions, and build and maintain body structures. There are two types of reactions that accomplish this: anabolism and catabolism.
Anabolism is the process whereby...

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Related Experiment Video

Updated: Jul 5, 2026

Three-dimensional Reconstruction of the Vascular Architecture of the Passive CLARITY-cleared Mouse Ovary
12:38

Three-dimensional Reconstruction of the Vascular Architecture of the Passive CLARITY-cleared Mouse Ovary

Published on: December 10, 2017

The ovary: anatomy and function throughout human life.

Ozgur Oktem1, Kutluk Oktay

  • 1Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology, New York Medical College, Munger Pavilion Room 617, Valhalla, NY 10595, USA.

Annals of the New York Academy of Sciences
|April 30, 2008
PubMed
Summary

Understanding normal ovarian development and function is key to addressing ovarian diseases and infertility. This review covers the molecular control of gonadal development, germ cell formation, folliculogenesis, and ovulation.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Molecular Endocrinology

Background:

  • Ovarian diseases and infertility necessitate a deep understanding of normal ovarian function.
  • Normal ovarian physiology is rooted in complex embryological development.
  • Key processes include germ cell development and folliculogenesis.

Purpose of the Study:

  • To review the molecular mechanisms governing ovarian development.
  • To provide updated information on germ cell formation and folliculogenesis.
  • To elucidate the molecular control of ovulation.

Main Methods:

  • Literature review of recent research.
  • Synthesis of data on molecular signaling pathways.
  • Focus on key regulatory genes and proteins.

Main Results:

  • Detailed overview of gonadal sex determination pathways.
  • Explanation of primordial germ cell migration and differentiation.
  • Description of follicular growth and selection processes.
  • Insights into the molecular triggers of ovulation.

Conclusions:

  • A comprehensive understanding of molecular events is crucial for reproductive health.
  • This review consolidates current knowledge on ovarian embryology and physiology.
  • Further research into these molecular pathways may offer new therapeutic targets for infertility and ovarian diseases.