MIDBRAIN AND THALAMUS OF NECTURUS 



321 



trl.Th.h.cp. - 

 trth.p.v.p.- 



f retr 



nuc.tub.p. 



com.Tub. post 



Fig. 29 Through the commissura posterior (com. post.) and the anterior end 

 of the pars dorsalis hypothalami (p.d.hyth.); cf. figure 7. The cell bodies of the 

 neurons of the pars dorsalis hypothalami are not impregnated, but their den- 

 drites and axons are shown, the latter forming the tractus mamillo-peduncularis, 

 part of which appears to enter the commissure of the tuberculum posterius, or 

 commissura hypothalami posterior {com. tub. post.). X 30 (cvc, 3-2-6). 



Fig. 30 Detail of the nucleus of the tuberculum posterius (nuc. tub. post.) 

 and pars dorsalis hypothalami (p.d.hyth.) of the right side, two sections caudad 

 of figure 29. The plane of section lies between those of figures 7 and 8. Den- 

 drites and axons from the pars dorsalis h3^othalami are impregnated, and also a 

 single neuron of the nucleus of the tuberculum posterius. Some dendrites re- 

 lated to the latter nucleus are drawn in from the adjacent sections rostrad and 

 caudad. X 74 (cvc, 3-2-8). 



