Journal of the Academy of Natural Sciences of Philadelphia . beinto the second occipitotemporal convolution. 4. The quatrihne pli de passage externe, Y, Fig. 21, passes into the thirdor inferior occipito-temporal convolution. 5. The pli de passage superiettr interne, 2, Fig. 22, when it exists as a dis-tinct and separate development, passes into the mesial surface of the superioroccipitofrontal convolution. MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. 89 6. The plis depassage inferieur interne (gyrus cunei), 1. Fig. 22, passes fromthe cuneus to join the mesial occipitofrontal convolution, and corr
Journal of the Academy of Natural Sciences of Philadelphia . beinto the second occipitotemporal convolution. 4. The quatrihne pli de passage externe, Y, Fig. 21, passes into the thirdor inferior occipito-temporal convolution. 5. The pli de passage superiettr interne, 2, Fig. 22, when it exists as a dis-tinct and separate development, passes into the mesial surface of the superioroccipitofrontal convolution. MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. 89 6. The plis depassage inferieur interne (gyrus cunei), 1. Fig. 22, passes fromthe cuneus to join the mesial occipitofrontal convolution, and corresponds morpho-logically to the posterior portion. Z. of the mesial occipitotemporal convolution,, which should also be considered as a passage fold if the others are to beregarded in that light. The accompanying diagrams will show that there areseven of these roots of origin of the anterior convolutions of the occipital lobesimilarly related to the occipital lobe on the one hand and to the occipito-frontaland temporal on the other. Fig. 21. Fig. The deuxihne pli de passage externe, 3, unites the arch of the conjoinedsuperior occipito-temporal and inferior occipito-frontal, whilst each of the othersconnects the remaining corresponding convolutions with the occipital lobe. Theyare thus intimately related with the morphological type developed in this paperand take their place as curiously developed parts of elements entering into thisplan. LOBULUS CENTRALIS. Most writers, as we have seen, consider this under the title of the centrallobe, but its structure and relations are manifestly so different from those of theother lobes, that I prefer to consider it under the name, lobulus centralis, orcentral cortical nucleus. It is closely related and is in direct connection with thegreat ganglionic mass of the hemisphere, the corpus striatum, and is symmetric-ally placed in its relations with the three lobes of the hemisphere. It is wellshown in its relations and external appea
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