MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. 259 



of the hemisphere. He considers it doubtful whether the fissura occipitalis externa 

 can be considered as a primary furrow. 



On the mesial surface of the brain he also distinguishes an inner primary fur- 

 row (fissura calloso-marginalis) and a lower primary furrow (fissura collateralis) . 



He also endeavors to show that each of these primary furrows, follows as it 

 were the type of the Sylvian fissure ; that is, they each present a stem, and upper 

 and posterior branch ; he endeavors to point out in the development of these 

 fissures these different parts. By means of these so-called primary furrows, Pansch 

 divides the surface of the cerebral hemispheres in the Primates, as follows : 



A. OUTER SURFACE. 



I. Inferior frontal lobule (Stirnwulst) . 



1. Inferior portion — Lowermost frontal or orbital convolution. 



2. Superior portion — Inferior frontal convolution. 



II. Superior frontal lobule. 



3. Anterior superior portion — Superior frontal convolution. 



4. Anterior inferior portion — Middle frontal convolution. 



5. Posterior portion — Posterior or ascending frontal convolution (anterior 



central). 



III. Superior parietal lobule (Scheitelwulst). 



6. Anterior portion — Anterior or ascending parietal convolution (posterior 



central) . 



7. Posterior portion — Superior parietal convolution. 



IV. Inferior parietal lobule. 



8. Inferior parietal convolution. 



V. Anterior temporal lobule (Schlafenwulst). 



9. Superior temporal lobule — Superior temporal convolution. 



VI. Inferior temporal lobule. 



10. Inferior portion — Inferior temporal convolution. 



11. Superior portion — Middle temporal convolution. 



VII. Occipital lobule. 



12 # Superior portion — Superior occipital convolution. 



13. Middle portion — Middle occipital convolution. 



14. Inferior portion — Inferior occipital convolution. 



B. MESIAL SURFACE. 



VIII. Mesial fronto-parietal lobule. 



15. Superior portion — Superior mesial fronto-parietal convolution. 



16. Inferior portion — Inferior mesial fronto-parietal convolution. 



IX. Mesial occipital lobule. 



