328 



C. JUDSON HERRICK 



sTrmed. 



Fig. 40 Detail from the extreme dorsal part of the pars dorsalis thalami of 

 the right side (one section ventrally of fig. 39). The origin of the tractus thal- 

 amo-frontalis anterior (tr.th.f.a.) is shown and the endings of a few dendrites 

 of neurons of the pars dorsalis thalami. Those in the more caudal part of the 

 region engage chiefly the tractus spino-thalamicus; those in the rostral part 

 chiefly the tractus tecto-thalamicus rectus (tr.t.th.r.); and some reach the ex- 

 treme dorsal part of the pars optica thalami (p.o.th.), which is not at this level 

 well differentiated. X 74 (cviic. 11). 



