Method XX 



127 



Section 6, to pass through the lower extremity of the oliva 

 and the point of the calamus scriptorius 



Draw, giving special attention to the following structures : 



Fissura mediana anterior, pyramis, raphe, and calamus scrip 

 torius. 



Nucleus funiculi 

 gracilis and nucleus 

 funiculi cuneati, 

 fibrae arcuatae inter- 

 nae, and decussatio 

 lemniscorum. 



Tractus spinalis 

 N. trigemini and sub- 

 stantia gelatinosa. 



Corpus resti- 

 forme, fibrae arcuatae 

 externae, nucleus oli- 

 varis inferior (oliva), 

 and nuclei laterales. 



What has become 

 of the canalis centra- 

 lis and the fissura 

 mediana posterior ? 

 How do the pyra- 

 mides differ from 

 those of the last sec- 

 tion ? What is the 

 significance of the 

 decussatio lemnisco- 

 rum ? Whence come the fibers composing it ? Are there any 

 evidences of nervi cerebrales other than of the trigeminus ? What 

 is the relation of the substantia gelatinosa to the tractus spinalis 

 N. trigemini? 



Section 7, to pass transversely through the middle of the 

 oliva. Let the section involve the overhanging cerebellar hemi- 

 sphere. 



Fig. 1. 

 Slightly diagrammatic representation of the ventral 

 aspect of the Rhombencephalon and Mesencephalon. 

 The verticals indicate the levels at which Sections 5 to 

 12 are to be taken. The figure is to be used supple- 

 mentary to the directions given under each section. In 

 certain cases the plane of the section will slant some- 

 what. 



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