. Carnegie Institution of Washington publication. RELATIVE WEIGHT AND VOLUME OF COMPONENT PARTS OF FETAL BRAIN. 53 to per cent, of which the medulla-pons represents per cent and the cerebellum per cent, thus showing the continued and rapid increase of the prosencephalon, especially the neopallium, over the other parts. No. 1400-22, 80 mm., estimated age 13J^ weeks. A still more decided advance in bulk and dif- ferentiation is here observed (fig. 6). The cerebral hemispheres are considerably more. ebel. Flo. 6.—Left view of model of brain-stem, embryo No. 1400-22, crown-rump len
. Carnegie Institution of Washington publication. RELATIVE WEIGHT AND VOLUME OF COMPONENT PARTS OF FETAL BRAIN. 53 to per cent, of which the medulla-pons represents per cent and the cerebellum per cent, thus showing the continued and rapid increase of the prosencephalon, especially the neopallium, over the other parts. No. 1400-22, 80 mm., estimated age 13J^ weeks. A still more decided advance in bulk and dif- ferentiation is here observed (fig. 6). The cerebral hemispheres are considerably more. ebel. Flo. 6.—Left view of model of brain-stem, embryo No. 1400-22, crown-rump length SO mm. X 6. extensive, the telencephalon totaling per cent of the entire weight of the encephalon. Of this the neopallium constitutes per cent and the corpus striatum per cent, a total of per cent. The archipallium weighs creased to per cent. The mesencephalon presents a sligh decrease, weighing now per cent. The total rhombencephalon has also lost relatively, weighing per cent, of which the cerebellum comprises per cent, the medulla-pons per cent. No. 1400-25, 119 mm., estimated age 16 weeks. The advance in general bulk is distributed in this embryo (figs. 7 and 8) as follows: The total prosencephalon constitutes per cent of the brain weight, of which the diencephalon com- prises per cent—a decrease, the telenceph- alon having meanwhile increased to per cent. To this the neopallium contributes per cent, the corpus striatum per cent, and the archipallium per cent. Of the latter the olfactory bulb shows a decreased weight of per cent, and the paraterminal body, fornix, and hippocampus a weight of per cent—a slight rise. The mesencephalon has fallen to per cent. The total rhombencephalon weighs per cent, of which the cerebellum forms per cent and the medulla-pons per cent, all of which weights are practically identical with those of the corresponding par
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