114 



INTRODUCTION TO NEUROLOGY 



If in the human brain we dissect away the cerebral cortex and 

 the cerebellar cortex and the white matter immediately con- 



Nucleus lentiformis 



Capsula interna 



(pars lenticulo- 



caudata) 



Tractus. __ 

 olfactorius 



Tractus ppticus '" \^-^f ! '" 

 Infundibulum-'''/^^ ' / 



Hypophy- / anterior lobe ''' ^^B>' / / 

 sis ceiebri \ posterior lobe- ^i / / ,{ 



Tuber cinereum/// \ 



Corpus mamillare// /i 



N. oculomotorius / /' } 



Basis pedunculi' / ,' 



Pons 7 / X 



Nervus trigeminus (portio major) x x " 

 Nervus trigeminus (portio minor)-' __-- 

 N. facialis" "J^ 

 N. intermedius^'-''^ 



N. abducens 



N. glossopharyngeus^.- 

 Nervus vagus j ,, 



Pytamis"" 



Oliva- 



Fasciculus circumolivaris pyramidis " 



Capsula interna (pars lenticulo-thalamica) 

 I Nucleus caudatus 



, Nucleus amygdalae (cut) 



Commissure anterior 

 terminalis 



Capeula interna (pars 

 sublenticularis) 

 Nucleus caudatus 



^Thalamus 



_Corpus geniculatum 



laterale 



-Corpus pineale 

 -Cor. geniculatum mediate 

 -Colljculus superior 

 -Colliculus inferior 



Lemniscus lateralis 

 Nervus trochlearis 

 Brachium conjunctivum 



Brachium 

 N, pontis 



^~_ Fossa flocculi 

 Cni8 flocculi 

 | Nucleus denta- 

 tus cerebelli 



Corpus ponto-bulbare 



Fasciculus spinocerebellaris 



-__ Nervus spinalis 



Fig. 45. Left lateral aspect of a human brain from which the cerebral 

 hemisphere (with the exception of the corpus striatum, the olfactory bulb 

 and tract, and a small portion of the cortex adjacent to the latter) and the 

 cerebellum (excepting its nucleus dentatus) have been removed. The 

 brain stem (segmental apparatus, palaeencephalon) includes everything 

 here shown with the exception of the strip of cortex above the tractus 

 olfactorius and the nucleus dentatus. Within its substance, however, are 

 certain cortical dependencies (absent in the lowest vertebrates), which 

 have been developed to facilitate communication between the brain stem 

 and the cerebral cortex. The chief of these are found in the thalamus, 

 basis pedunculi, and pons. Compare this figure with the side view of the 

 intact brain, Fig. 54. (Modified from Cunningham's Anatomy.) 



nected therewith we have the form shown in Fig. 45. 

 the human brain stem. 



This is 



