GENERAL ANATOMY OF THE NERVOUS SYSTEM 07 



of things. The bend in its axis is well indicated by an 

 outline of the cavities in the human brain and cord. 

 The aqueduct of Sylvius is inclined ventrally from the 

 line of the central canal of the cord, and the lateral 

 ventricles in the cerebral hemispheres are extended 

 approximately at right angles to this canal. The olfactory 



Fig. 12. : Above is the rabbit's brain from the left; below, the 

 human brain in vertical fore-and-aft section, also viewed from the 

 left. The bent axis is introduced in the lower figure. 



1, Cerebrum; 2, cerebellum; 3, midbrain; 3d, corpora quad- 

 rigemina; 3v, crura cerebri; 4, pons; 5, medulla; 111, third ven- 

 tricle, which is flanked by the diencephalon; IV, fourth ventricle. 



.outgrowths are also found to be in a plane perpendicular 

 to the course of the cord. 



If, now, we make allowance for the two conditions indi- 

 cated the overwhelming growth of the cerebrum and 

 cerebellum and the rather sharp crook in the axis we shall 

 find it easy to see that, after all, the sequence of the 



