PLATE 27 
EXPLANATION OF FIGURES 
101 Transection slightly caudal to the level shown in fig. 100. Weigert 
method. X 17. 
102. Transection through the decussation of the tractus hypothalamo-olfactoru 
mediales. Ramon y Cajal method. X 46. 
com. horiz., commissura horizontalis; com. post., commissura posterior; com. 
trans., commissura transversa; dec. tr. hyp. olf. med., decussatio tractorum olfac- 
toriorum medialium; fasc. retr. fasciculus retroflexus; lob. lat. hyp., lobus lateralis 
hypothalami; lob. med. hyp., lobus medialis hypothalami; nucl. dif. lob. lat., 
nucleus diffusus lobi lateralis; nucl. prerot., nucleus prerotundus; nucl. rot., 
nucleus rotundus; nucl. subrot., nucleus subrotundus; rec. lat. hyp., recessus 
lateralis hypothalami; tr. cbl. tect. + tr. rot. lent. + com. horiz., tractus cerebello- 
tectalis plus tractus rotundo-lentiformis plus commissura horizontalis; tr. hab. 
dien.<——, tractus habenulo-diencephalicus; tr. hyp. olf. med., tractus hypo- 
thalamo-olfactorius medialis; tr. olf. thal. med., pars dors., tractus olfacto-tha- 
lamicus medialis, pars dorsalis; tr. olf. thal. med., pars vent., tractus olfacto- 
thalamicus medialis, pars ventralis; tr. rot. lob., tractus rotundo-lobaris; tr. strio- 
thal. cruc. + tr. olf. hyp. lat., tractus strio-thalamicus cruciatus plus tractus 
olfacto-hypothalamicus lateralis; ¢r. thal. mam., tractus thalamo-mammillaris; tr. 
thal. sp., tractus thalamo-spinalis (KKappers). 
308 
