FIGURE 5.

Artiodactyls fit the non-neuronal scaling rules for all brain structures and mammalian clades. Plots show the relationship between structure mass and number of non-neuronal (other) cells for (A) each brain structure or (B) the brain as a whole. Circles, cerebral cortex (A) or whole brain (B); squares, cerebellum; triangles, rest of brain. Functions plotted apply to the ensemble of species, including artiodactyls. Exponents are 1.035 ± 0.017 (A) and 1.020 ± 0.026 (B). Artiodactyl species in black, primates in red, glires in green, afrotherians in blue, insectivores in orange, scandentia in gray. Data from Herculano-Houzel et al. (2006, 2007, 2011), Azevedo et al. (2009), Sarko et al. (2009), Gabi et al. (2010), and Neves et al. (2014).