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Hormonal Control of the Ovarian Cycle

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...

Hormonal Regulation of the Menstrual Cycle

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.

Feedback Regulation of Calcium Concentration

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...

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 length...

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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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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.
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Related Experiment Video

Updated: May 25, 2026

Unraveling the Role of Discrete Areas of the Rat Brain in the Regulation of Ovulation through Reversible Inactivation by Tetrodotoxin Microinjections

Unraveling the Role of Discrete Areas of the Rat Brain in the Regulation of Ovulation through Reversible Inactivation by Tetrodotoxin Microinjections

Published on: September 3, 2020

Neuroendocrine control of ovulation.

Sarah Berga¹, Frederick Naftolin

¹Department of Obstetrics and Gynecology, Wake Forest University, Winston-Salem, NC, USA.

Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology

|January 31, 2012

Summary

Hypothalamic failure, disrupting gonadotropin-releasing hormone (GnRH) regulation, causes anovulation and amenorrhea. Diagnosis is crucial as it leads to downstream diseases beyond reproductive failure.

Area of Science:

Reproductive Endocrinology
Neuroendocrinology
Human Physiology

Background:

Distinguishing hypothalamic from ovarian failure is essential for diagnosing anovulation/amenorrhea.
The hypothalamic-pituitary-ovarian (HPO) axis regulates the menstrual cycle through complex feedback loops.
External and internal factors can disrupt the neuroendocrine control of GnRH pulsatility.

Purpose of the Study:

To elucidate the neuroendocrine regulation of the ovarian cycle, focusing on hypothalamic control.
To detail the feedback mechanisms involving GnRH, pituitary gonadotropins, and ovarian steroids.
To explore the causes and consequences of hypothalamic insufficiency leading to anovulation/amenorrhea.

Main Methods:

Review of neuroendocrine pathways governing GnRH secretion and feedback.

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Analysis of the roles of estradiol, progesterone, and inhibin in regulating the HPO axis.

Categorization of causes for hypothalamic amenorrhea: genetic, neural input, and pharmacological.

Main Results:

Hypothalamic failure disrupts GnRH pulsatility, leading to anovulation and amenorrhea.
Abnormal negative feedback between estradiol and gonadotropins (low estradiol, LH/FSH) characterizes hypothalamic amenorrhea.
Causes include genetic defects, stress, weight loss, elevated prolactin, and psychotropic medications.

Conclusions:

Hypothalamic insufficiency results in inadequate ovarian stimulation and downstream health complications.
The diagnosis and treatment of hypothalamic failure are critical due to its systemic effects beyond reproductive health.
Understanding central regulation is key to managing anovulation and preventing associated diseases.