The Pineal Gland is a tiny pine-cone-shaped endocrine gland about the size of a grain of rice, tucked in a small groove where the two halves of the thalamus join. Aside from regulating sleep and wakefulness through melatonin production, the pineal gland, also known as the third eye, has been referred to the principal seat of the soul and is a common focus of spirituality and mysticism.
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