Table 1.
Average structure mass and number of cells in each brain and spinal cord.
| Structure mass | LH | RH | Total |
|---|---|---|---|
| CEREBRAL CORTEX | |||
| Average, g | 0.113 ± 0.004 | 0.111 ± 0.004 | 0.226 ± 0.008 |
| Minimum mass, g | 0.085 | 0.080 | 0.170 |
| Maximum mass, g | 0.134 | 0.137 | 0.267 |
| Variation | 1.58 × | 1.71 × | 1.57 × |
| CEREBELLUM | |||
| Average, g | 0.032 ± 0.002 | 0.033 ± 0.001 | 0.065 ± 0.003 |
| Minimum mass, g | 0.024 | 0.024 | 0.048 |
| Maximum mass, g | 0.050 | 0.044 | 0.090 |
| Variation | 2.08 × | 1.83 × | 1.88 × |
| OLFACTORY BULB | |||
| Average, g | 0.008 ± 0.001 | 0.009 ± 0.001 | 0.017 ± 0.001 |
| Minimum mass, g | 0.004 | 0.004 | 0.011 |
| Maximum mass, g | 0.012 | 0.014 | 0.023 |
| Variation | 3.0 × | 3.5 × | 2.09 × |
| REMAINING AREAS | |||
| Average, g | 0.080 ± 0.004 | 0.081 ± 0.003 | 0.161 ± 0.007 |
| Minimum mass, g | 0.054 | 0.062 | 0.121 |
| Maximum mass, g | 0.113 | 0.105 | 0.218 |
| Variation | 2.09 × | 1.69 × | 1.80 × |
| SPINAL CORD | |||
| Average, g | 0.098 ± 0.002 | ||
| Minimum mass, g | 0.079 | ||
| Maximum mass, g | 0.118 | ||
| Variation | 1.49 × | ||
| WHOLE BRAIN | |||
| Average, g | 0.454 ± 0.010 | ||
| Minimum mass, g | 0.386 | ||
| Maximum mass, g | 0.514 | ||
| Variation | 1.33 × | ||
| Numbers of neurons | LH | RH | Both |
| CEREBRAL CORTEX | |||
| Average, million | 4.785 ± 0.226 | 5.027 ± 0.272 | 9.859 ± 0.418 |
| Minimum, million | 2.366 | 3.484 | 7.294 |
| Maximum, million | 6.011 | 7.225 | 12.900 |
| Variation | 2.54 × | 2.07 × | 1.77 × |
| CEREBELLUM | |||
| Average, million | 16.901 ± 1.383 | 14.330 ± 1.048 | 30.664 ± 2.156 |
| Minimum, million | 8.432 | 7.815 | 16.200 |
| Maximum, million | 27.100 | 23.400 | 47.000 |
| Variation | 3.21 × | 2.99 × | 2.90 × |
| OLFACTORY BULB | |||
| Average, million | 1.489 ± 0.199 | 1.360 ± 0.151 | 2.756 ± 0.326 |
| Minimum, million | 0.746 | 0.682 | 1.428 |
| Maximum, million | 3.376 | 2.804 | 6.180 |
| Variation | 4.53 × | 4.11 × | 4.33 × |
| REMAINING AREAS | |||
| Average, million | 4.371 ± 0.363 | 4.700 ± 0.328 | 8.797 ± 0.684 |
| Minimum, million | 2.975 | 3.141 | 5.051 |
| Maximum, million | 8.746 | 8.832 | 17.600 |
| Variation | 2.94 × | 2.81 × | 3.48 × |
| SPINAL CORD | |||
| Average, million | 0.645 ± 0.027 | ||
| Minimum, million | 0.390 | ||
| Maximum, million | 0.874 | ||
| Variation | 2.24 × | ||
| WHOLE BRAIN | |||
| Average, million | 47.463 ± 1.809 | ||
| Minimum, million | 38.900 | ||
| Maximum, million | 63.600 | ||
| Variation | 1.63 × | ||
| Numbers of other cells | LH | RH | Both |
| CEREBRAL CORTEX | |||
| Average, million | 4.402 ± 0.278 | 4.366 ± 0.196 | 8.252 ± 0.404 |
| Minimum, million | 2.443 | 3.219 | 4.224 |
| Maximum, million | 6.729 | 6.255 | 11.600 |
| Variation | 2.75 × | 1.94 × | 2.75 × |
| CEREBELLUM | |||
| Average, million | 2.555 ± 0.371 | 2.011 ± 0.220 | 4.416 ± 0.541 |
| Minimum, million | 0.477 | 0.582 | 0.674 |
| Maximum, million | 6.024 | 3.494 | 8.431 |
| Variation | 12.64 × | 6.00 × | 12.51 × |
| OLFACTORY BULB | |||
| Average, millions | 1.487 ± 0.199 | 1.336 ± 0.129 | 2.731 ± 0.308 |
| Minimum, millions | 0.834 | 0.830 | 1.670 |
| Maximum, millions | 3.514 | 2.446 | 5.960 |
| Variation | 4.21 × | 2.95 × | 3.57 × |
| REMAINING AREAS | |||
| Average, million | 3.962 ± 0.456 | 4.019 ± 0.340 | 7.733 ± 0.795 |
| Minimum, million | 2.287 | 2.529 | 3.749 |
| Maximum, million | 8.204 | 7.168 | 15.400 |
| Variation | 3.59 × | 2.83 × | 4.11 × |
| SPINAL CORD | |||
| Average, million | 3.855 ± 0.082 | ||
| Minimum, million | 3.264 | ||
| Maximum, million | 4.481 | ||
| Variation | 1.37 × | ||
| WHOLE BRAIN | |||
| Average, million | 20.492 ± 1.177 | ||
| Minimum, million | 10.700 | ||
| Maximum, million | 31.900 | ||
| Variation | 2.98 × | ||
Values are averages ± SE. Variation refers to the ratio between maximum and minimum values for each parameter. Values for the whole brain do not include the olfactory bulb.