8 



RANA 



13. Central nervous system seen from above, as exposed by removing the roof of the skull and the neural 

 arches : olfactory lobes (fused) ; cerebral hemispheres ; thalamencephalon ; optic lobes ; cerebellum ; medulla oblongata ; 

 fourth ventricle ; spinal cord ; dorsal fissure of spinal cord. 



14. The same removed from the body and seen with its ventral side uppermost : olfactory lobes ; cerebral 

 hemispheres ; optic chiasma ; infundibulum ; pituitary body ; crura cerebri ; ventral fissure of spinal cord. 



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