"Debunking the Myth: The Truth About Tongue Taste Buds"

TL;DR
The long-held belief that specific tastes are confined to certain areas of the tongue is a myth, debunked by decades of research. The original 1901 study by David Hanig, often misinterpreted, actually measured sensitivity rather than segregation of tastes. Taste receptors are not limited to the tongue but are also found in various organs throughout the body, playing a complex role in signaling the brain about nutrients and toxins.
The Textbooks Were Wrong About That Map of the Tongue's Taste Buds The New York Times
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