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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“Herein Fortune shows herself more kind
Than is her custom. It is still her use
To let the wretched man outlive his wealth,
To view with hollow eye and wrinkled brow
An age of poverty; from which lingering penance
Of such misery doth she cut me off.”
—William Shakespeare (1564–1616)