The Pineal Gland – Anatomy, Physiology & Altered States of Consciousness

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Lesson Overview

In this lesson, we explore the anatomy, physiology and significance of the pineal gland.


Become familiar with the anatomy and physiology of the pineal gland, plus its historical significance and connection to altered states of consciousness.


Describe the physical characteristics of the pineal gland, including its unique isolation from the blood-brain barrier system. Explain the physiology of the pineal gland and describe what is currently understood about the role of the hormones, serotonin and melatonin. Describe ancient lore and the historical significance of the pineal gland; contrast this with modern science, which was ignorant of the gland’s physiology but has recently become aware of what was already previously known by other sources. Explore the relationship between the pineal gland, the third eye or ajna chakra, and altered states of consciousness.

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