92 THE STRUCTURE OF THE FOWL 



The chief structures of the adult brain may- 

 be tabulated as follows : — 



Hind-Brain 



Mid-Brain 



Medulla oblongata. 

 Cerebellum. 

 . Fourth ventricle. 



'' Peduncles of the cerebrum. 

 Optic lobes. 



Fore-Brain 



. Aqueduct. 



Thalamus. 



Pineal body. 



Infundibulum. 



Hypophysis. 



Optic tracts and chiasma. 



Cerebral hemispheres. 



Olfactory lobes. 



Third ventricle. 



Lateral ventricles. 



The medulla oblongata bears a close re- 

 semblance to the spinal cord, with which it 

 is continuous at a somewhat abrupt bend. 

 The medulla, however, is wider than the cord, 

 and in it the central canal widens out into 

 the fourth ventricle. 



The cerebellum lies upon and is connected with 

 the medulla oblongata. In front it is in contact 

 with the cerebral hemispheres. Elongated and 



