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INTRODUCTION TO NEUROLOGY 



both the hypothalamus and the epithalamus. This is the prob- 

 able pathway taken by voluntary motor impulses of cortical 

 origin, in which the olfactory element is dominant, such as 

 sniffing. Having reached the hypothalamus and epithalamus, 

 these motor impulses of cortical origin are conveyed to the motor 

 centers in the midbrain by the same pathways as are the reflex 

 impulses already described. 



Fig. 107. Section across the hippocampus and gyms hippocampi of the 

 human brain. (After Edinger.) 



Summary. The olfactory centers (rhinencephalon) make up 

 nearly the entire forebrain in fishes, and in higher vertebrates 

 progressively more non-olfactory centers are added to this part 

 of the brain. The non-olfactory parts of the cerebral hemi- 

 sphere comprise chiefly the corpus striatum and the neopallium; 



