MIDBRAIN AND THALAMUS OF NECTURUS 



329 



Fig. 41 Through the diencephalon, including on the left the ventral border 

 of the pars dorsalis thalami, and on the right passing through the sulcus 

 medius thalami. On the left side collaterals are leaving the marginal optic 

 tract (tr.op.) to enter the pars optica thalami (p.o.th.). X 23 (cviic, 16). 



