202 



ANIMAL BIOLOGY 



A 



Fore-brain 



Mid-brain 



Telencephalon 



Diencephalon 



Mid-brain 



B 



Hind-brain 



Cerebellum 



Medulla 



Cerebral hemisphere Pineal body 



Cerebellum 



Medulla 



Telencephalon 7 / 



Diencephalon 

 Cerebral hemispheres 



Olfactory 

 lobes 



Infundibulum 



Mid-brain /-Cerebellum 



Medulla 



Fig. 140. — Diagrams to illustrate the general method of transformation of 

 the anterior end of the neural tube into the brain. A, B, C, median vertical 

 sections; D, dorsal view of C. 



