TEXT-BOOK OF PHYSIOLOGY 



4. The parieto-occipital fissure, situated on the mesial surface of the hemi- 

 spheres, divides the latter into a parietal and an occipital lobe. It begins 

 as a deep notch on the surface of the hemisphere, and is then continued- 

 downward and forward until it enters the calcarine fissure. (Fig. 243.) 



SUPfKCf/IJRAL f. 



FIG. 242. FISSURES AND GYRI ON THE LATERAL SURFACE or THE LEFT HEMI-CEREBRUM. 

 F. Fissure. G. Gyrus. R. Ramus. (Spitzka.) 



FIG. 243. FISSURES AND GYRI OF THE MESIAL SURFACE OF THE LEFT HEMI-CEREBRUM. 



(Spitzka.) 



5. The calcarine fissure begins on the posterior extremity of the mesial surface 

 of the occipital lobe. From this point it passes downward and forward 

 to unite with the parieto-occipital fissure. 



