-^com. ted 



com cb. 



Im. 



— fr sp. ch. V 



- - tr. sp. T 

 Tr. sp ch. d. 



27 



Fig. 25 Part of a sagittal section through the brain of Necturus stained by the 

 VVeigert method. The section is strictly medial and includes the caudal end of the 

 tectum mesencephali, the recessus posterior mesencephali with the overlying 

 frenulum of the velum medullare anterius, and the decussatio veli. X 75. 



Fig. 26 Parasagittal section through the lateral part of the body of the cere- 

 bellum of Necturus, illustrating a few neurones whose dendrites are directed 

 forward and downward to engage terminals of the tractus hypothalamo-cerebel- 

 laris, cf. figure 19. Golgi method. X 30. 



Fig. 27 Diagram of the cerebellar tracts of Necturus; cf. figure 1. The tractus 

 cerebello-tegmentalis, tecto-cerebellaris and hypothalamo-cerebellaris are omit- 

 ted. The tracts here indicated are all medullated wholly or in part, except 

 the commissura cerebelli lateralis (com.cb.l.). The connections of the area acus- 

 tico-lateralis are not included. Unmedullated connections between these struc- 

 tures and the cerebellum may exist, but these have not been determined. 



28 



