1. It's for the fungiform papillae.

2. In mammals, four different types of tongue papillae (fungiform, Circumvallate, foliate and filiform) can be found on the dorsal surface (Emura et al., 2006), but the structure of the tongue reveal a variability of morphological features related to the type of food, habit, and taxonomy (Jackowiak & Godinicki, 2005; Okada & Schraufnagel, 2005).