110 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



Let us, now that we have learned something concerning 

 the region of the corpora quadrigemina, take up the study of a 

 section made perhaps 5 millimetres behind the structures shown 

 in Fig. 59. This section divides the two pairs of quadrigeminal 

 bodies, passes through the underlying tegmentum, and lastly 

 through the pedunculus cerebri. 



Let us first study those structures which we have already 



fubsfaniia niara 



f/inferef Langsbundel. 



FIG. 62. 



Cross-section through the anterior quadrigeminal bodies (somewhat diagrammatic). 



Ann flea Vir.rhtiijel*, Brachium of corpus quadrigeminum. 

 ffanbe. Tegmentum. Hinteres LU iiflxhtindel, Post, longitud. fasciculus. 



Pyramis, Pyramid. Rnther Kern, Red nucleus. 



Vorderer Vierhuyel, Anterior quadrigeminal body. 



Fuss, Crusta. 

 Schlcife, Fillet. 



met with. Externally on each side is the pulvinar thalami, 

 from which the optic nerve seems to arise, the corpus genicu- 

 latum laterale, as it were, inserted into its course. It receives 

 a thick auxiliary bundle from the brachium of the anterior 

 quadrigeminal body (shown most clearly on the left), above 

 which you will recognize the corpus geniculatum mcdiale, which 

 has been cut into by the section. 



Below the pulvinar arises the pedunculus cerebri. At this 



