162 



Nucleus habenulae 

 -- Nucleus of the ocul omo tor i us 



- Nucleus of tbe trocMearis 

 Recessus neuroporicus 



- Nucleus pos tol f 8C tor i u s 

 -- Nucleus strati grisei 



Oblongata 



- Olfactory fibre 



- Olfactory ventricle 



- Optic fibre 

 Pall i al com-ni ssure 

 Pall i al eani nence 

 Layer of tbe neurones of Purkinje 



- NeuroDe of the tractus pallii 

 Ventricle of the pallial eminence 



X.-- Ramus lateralis vagi 



Roof-nucleus of the midbrain 

 -- Tract of the midbrain roof-nucleus 

 -- StratuiE medullars profunduor. 

 Superficial neurones 



- Spinal V tract 

 General striatum 

 Tuberculum acusticum 



-- Tela choroidea posterior 

 -- Tela choroidea superior 

 Thai amus 



Tract-neurone 

 s.-- Tractus cerebello-spinalis 



- Tractus pallii 

 -- Vi scero-mo to r fibre 

 -- Viscero-mo tor nucleus 



PLATK I, 



Pig.l. Median sagittal section through the brain of an 

 adult Mustelus. The right lateral ventricle of the fore brain 

 is indicated in broken outline. Natural size. 



