What Causes Black Hairy Tongue? A black hairy tongue is caused by too much bacteria or yeast growth in the mouth. The bacteria build up on tiny rounded projections called papillae. These lie along the ...

The tongue is a muscular organ in the mouth. It's covered with moist, pink tissue called mucosa. Tiny bumps called papillae give the tongue its rough texture. Thousands of taste buds cover the ...

A trio of researchers at the University of Akron in Ohio has conducted a study of the polar bear paw with a focus on the papillae—the microstructures on the footpad that help with traction. Nathaniel ...