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Related Concept Videos

The Pineal Gland01:02

The Pineal Gland

The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
Major Hormones and Their Functions01:27

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...
The Placebo Effect01:54

The Placebo Effect

The placebo effect occurs when people's expectations or beliefs influence or determine their experience in a given situation. In other words, simply expecting something to happen can actually make it happen.
Extrasensory Perception01:23

Extrasensory Perception

Extrasensory perception, or ESP, suggests the ability to perceive events beyond the conventional senses of sight, hearing, and touch. Parapsychologists, who research ESP and related psychic phenomena, categorize ESP into three main types: precognition, telepathy, and clairvoyance.
Precognition involves foreseeing future events, such as predicting an accident before it happens. An example of precognition could be someone dreaming about a specific event, like a car crash, which then occurs...
Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.

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A dimensional approach to hypersomnolence disorder without comorbidity: results from a French preliminary study and data visualization.

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Related Experiment Video

Updated: May 13, 2026

Endoscopic Third Ventriculostomy and Pineal Biopsy from a Single Entry Point
03:13

Endoscopic Third Ventriculostomy and Pineal Biopsy from a Single Entry Point

Published on: June 28, 2024

The Pinealoprive Syndrome: Myth or Reality?

Laure Peter-Derex1,2, V Raverot3,4

  • 1Center for Sleep Medicine, Hospices Civils de Lyon, Lyon 1 University, Lyon, France. laure.peter-derex@chu-lyon.fr.

Advances and Technical Standards in Neurosurgery
|May 11, 2026
PubMed
Summary
This summary is machine-generated.

Melatonin

Keywords:
CircadianMelatoninPinealSleepSurgery

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Area of Science:

  • Neuroendocrinology
  • Chronobiology
  • Oncology

Background:

  • Melatonin, primarily from the pineal gland, regulates circadian rhythms and sleep.
  • Pineal gland lesions and pinealectomy models explore melatonin deficiency effects.
  • Pineal tumors can impact melatonin secretion, with malignant profiles often showing impaired secretion.

Purpose of the Study:

  • To investigate the effects of pineal gland-related melatonin suppression on health and sleep.
  • To clarify the link between melatonin depletion and sleep quality post-pinealectomy.
  • To explore potential extra-neurological effects and long-term impacts of melatonin depletion.

Main Methods:

  • Analysis of melatonin levels in patients with pineal gland tumors and post-pinealectomy.
  • Observational studies on sleep quality in relation to melatonin levels.
  • Review of existing literature on pineal gland function and melatonin's role.

Main Results:

  • Melatonin assays can monitor pineal gland resection completeness.
  • The direct impact of melatonin depletion on sleep quality remains unclear.
  • No clear extra-neurological effects of pineal gland damage are evident, possibly due to extra-pineal sources.

Conclusions:

  • Further large-scale, prospective studies are needed to confirm melatonin's impact on health and sleep.
  • No current recommendations exist for melatonin supplementation post-pinealectomy.
  • Exogenous melatonin may be pragmatically considered for sleep disorders in pinealectomy patients.