334 



C. JUDSON HERRICK 



^^: i^oiD Jijp^r 



strme 



Ti:tth.h.c.p. 



p.d.hyth. 



fmedt. 

 fretr 

 Trmam.ped. 

 nl. 

 fi. 



com.v 

 -f.vt. 



Fig. 46 Through the commissura hippocampi, the dorsal part of the nucleus 

 preopticus, the tuberculum posterius, and the fovea isthmi. Some of the im- 

 perfectly impregnated neurons of the preoptic nucleus are sketched in from the 

 adjacent section dorsally. The component of the medial forebrain bundle 

 which enters the cerebral peduncle {J.med.t.) is probably the tractus olfacto- 

 tegmentalis, though the source of its fibers is unknown. The slender varicose 

 fibers provisionally marked tr.mam.ped. are of doubtful significance. Mingled 

 with them are coarse dendrites of the cells of the tuberculum posterius. The 

 appearances suggest that they come from the pars dorsalis hypothalami, though 

 their connection with these neurons has not been observed. They end by free 

 arborizations laterally of the tuberculum posterius and fovea isthmi (cf. fig. 

 47). X 23 (cviic, 25). 



