GENERAL ANATOMY OF THE NERVOUS SYSTEM 03 



of this superior portion of the system as it is seen in the 

 frog. 



Following the spinal cord to the most anterior vertebra 

 we find that it is here continuous with the tapering hind 



--Olfactory lobes 



Cerebral 

 Hemispheres 



Cerehdlurr) 

 - Medulla 



Fig. 11. Above, the frog's brain is shown in its dorsal aspect 

 and, within a similar outline, its cavities. The two lateral ventricles 

 are not numbered. The cavities extending into the optic lobes are 

 not made black because they are not characteristic of higher forms. 



Below is the brain of the rabbit (dorsal view), to show how the 

 miclbrain is nearly concealed by the large cerebrum and cerebellum. 

 (The scale of this drawing is much smaller than that used for the 

 frog.) 



end of the brain, the medulla, or bulb. The line of demarca- 

 tion between brain and cord is assumed to lie between the 

 back edge of the skull and the first vertebra; there is no 

 sudden change in the appearance of the nervous axis 



