Table 1.
Comparative cellular composition of the brain of the tree shrew and six primate species
| Species | Body mass, g | Brain mass, g | Total neurons, ×106 | Total nonneurons, ×106 |
|---|---|---|---|---|
| Tree shrew | 172.5 ± 3.5 | 2.752 ± 0.011 | 261.40 | 199.65 |
| Marmoset | 361.0 ± 1.4 | 7.780 ± 0.654 | 635.80 ± 115.73 | 590.74 ± 70.81 |
| Galago | 946.7 ± 102.6 | 10.150 ± 0.060 | 936.00 ± 115.36 | 666.59 ± 63.50 |
| Owl monkey | 925.0 ± 35.4 | 15.730 | 1,468.41 | 1,195.13 |
| Squirrel monkey | n.a. | 30.216 | 3,246.43 | 2,075.03 |
| Capuchin monkey | 3,340.0 | 52.208 | 3,690.52 | 3,297.74 |
| Macaque monkey | 3,900.0 | 87.346 | 6,376.16 | 7,162.90 |
| Variation, macaque/marmoset | 10.8× | 11.2× | 10.0× | 12.1× |
Species ordered by increasing brain size. Values are mean ± SD. n.a., not available.