THE STKUCTURE OF THE BRAIN STEM 411 



C-B 



AMMOCCETES 



TELEOSTEA 



AMPHIBIA 



CB 



REPTILIA 



MAMMALIA 





FIG. 181. Diagrammatic view of the brain in different classes of vertebrates. 



(GASKELL.) 



CB, cerebellum; PT, pituitary body; PN, pineal body; C.STK, corpus 

 striatum ; GHR, right ganglion habenulse ; i, olfactory ; n, optic nerves. 



