THE CEREBRUM 



retina of the same side and in the lower medial quadrant of 

 the retina of the opposite side. This condition is known as 

 lower quadrantic hemianopia. If, however, the lesion is con- 

 fined to the area below the calcarine fissure, the upper 



FIG. 6. Medial Aspect of Right Cerebral Hemisphere. 



1. Genu of corpus callosum. 



2. Gyrus cinguli. 



3. Sulcus cinguli (calloso-marginal). 



4. Body of corpus callosum. 



5. Motor centre for lower limb. 



6. Central sulcus (of Rolando). 



7. Splenium of corpus callosum. 



8. Parieto-occipital fissure. 



9. Cuneus. 



10. Rostrum of corpus callosum. 

 it. Septum pellucidum. 



12. Column of fornix. 



13. Interventricular foramen (of Monro); 



14. Thalamus. 



15. Lamina terminalis. 



16. Optic chiasma. 



17. Uncus. 



18. Cut surface of mid-brain. 



19. Calcarine fissure. 



20. Collateral fissure. 



21. Lingual gyrus. 



22. Calcarine fissure. 



quadrants of the retinae are affected. Finally, when the 

 lesion involves both areas, homonymous hemianopia is the 

 result (see p. 52). 



The Septum Pellucidum is a bilaminar membrane which 

 occupies the concavity of the genu of the corpus callosum 



