Table 1.

Constants and exponents for neuronal and non-neuronal scaling rules.

	Neuronal scaling rules		Glia cells scaling rules
	kn (g)	αn	kg (g)	αg
CEREBRAL CORTEX
Rodents	2.093 × 10−13	1.688	1.439 × 10−9	1.128
Primates	5.674 × 10−9	1.087	6.941 × 10−9	1.036
Eulipotyphlans	8.060 × 10−13	1.598	1.015 × 10−9	1.143
CEREBELLUM
Rodents	4.172 × 10−12	1.334	9.267 × 10−9	1.016
Primates	1.084 × 10−9	1.028	2.564 × 10−7	0.861
Eulipotyphlans	1.946 × 10−10	1.297	1.726 × 10−9	1.094
REST OF BRAIN
Rodents	6.711 × 10−12	1.534	1.985 × 10−9	1.105
Primates	1.084 × 10−9	1.214	3.512 × 10−9	1.065
Eulipotyphlans	1.946 × 10−10	1.297	2.819 × 10−8	0.926

Constants k_n and k_g and exponents a_n and a_g relate structure mass to the number of neurons or other cells that compose the structure according to Equations 1.1 and 1.2, which are respectively M = k_n N _n^αn and M = k_g N _g^αg.