A parietal eye, also known as a third eye or pineal eye, is a part of the epithalamus present in some animal species. The eye is photoreceptive and is associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.
Read more about Parietal Eye: Function, Anatomy, Comparative Anatomy, Analogs in Other Species, See Also
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“If a man’s eye falls
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—Hla Stavhana (c. 50 A.D.)