em.th. 



nuc.p.o.th. 



trth-pd-p. 

 trth.ta 



p.vth. 



trTh.p.d.p. 

 trtth.h.c.p. 





s.a. 



Fig. 42 Through the dorsal part of the pars ventralis thalami of the right 

 side. At the rostral end of the figure is the eminentia thalami {evi.ih.). The 

 fibers of the tractus cortico-thalamicus {ir.c.th.) laterally of it are in part sketch- 

 ed in from sections farther ventrally. No neurons of the nucleus of the pars 

 optica thalami (nuc.p.o.th.) are impregnated (cf. fig. 48), but the more rostral 

 fibers of the tractus thalamo-peduncularis dorsalis profundus (tr.th.p.d.p.) 

 shown appear to be axons from this nucleus. Mingled with them are probably 

 axons of the tractus thalamo-peduncularis ventralis profundus from the pars 

 ventralis thalami and eminentia thalami. The significance of the tract marked 

 tr.hab.lh. is obscure. Comparison with other preparations suggests a connec- 

 tion between the habenula and the pars ventralis thalami termed provisionally 

 tractus habenulo-thalamicus. X 74 (cviic, 16). 



330 



