| Weight of the brain in grams | Cranial capacity in cubic centimetres |
|---|---|
| 1,450 | 1,650 |
| 1,350 | 1,550 |
| 1,250 | 1,450 |
| 1,150 | 1,350 |
Figures given by Manouvrier:
| Weight of the brain in grams | Cranial capacity in cubic centimetres |
|---|---|
| 1,700 | 1,949 |
| 1,450 | 1,663 |
| 1,250 | 1,432 |
| 1,000 | 1,147 |
Increase in the Volume of the Brain.—Studies regarding the growth of the head, although not yet complete, have gone sufficiently far to give us some useful ideas. In regard to the volume in a general sense, the cranium in its growth obeys the cerebral rhythm.
We shall speak in the section on Technique of the methods of measuring the head: at present it will suffice to point out that the measurements may be made directly upon the cranium, and the cranial capacity calculated directly from the head: and that the maximum linear measurements are sufficient to indicate the volume—such measurements being the three maximum diameters, longitudinal, transverse, and vertical, and the maximum circumference. Even the forehead, as an index of the general volume of the brain, is of interest in researches relating to the volumetric growth of the head.
Regarding the growth of the several cranial dimensions, the most accurate and complete knowledge is furnished by Binet's researches among the school-children of Paris (1902).
This author has made special investigations into the rhythm of growth of the cranium and of the face, with special reference to the period of puberty. The following are the mean averages obtained by him, relative to the three diameters corresponding to the three maximum dimensions of the head:
MEAN AVERAGES OF CEPHALIC MEASUREMENTS TAKEN UPON CHILDREN OF DIFFERENT AGES
(Binet: From the schools of Paris)
| Measurement | Kindergartens | Lower primary schools | Upper primary schools | Normal schools | |||||
|---|---|---|---|---|---|---|---|---|---|
| 4 years | 5 years | 8 years | 10 years | 12 years | 14 years | 14 years | 16 years | 18 years | |
| Antero-post. diameter | 169.5 | 173.9 | 174.7 | 177.1 | 181.5 | 181.5 | 185.3 | 188.3 | 190.4 |
| Transverse diameter | 140.6 | 141.7 | 145 | 145.7 | 147.9 | 150.1 | 155.5 | 152.3 | 156.7 |
| Vertical diameter | 118.8 | 121.6 | 122 | 122.8 | 127.6 | 129.7 | 128.1 | 131.4 | 130.8 |