THE NERVOUS SYSTEM 



147 



is often accompanied by pain in the distribution of the upper 

 dorsal nerves in the left arm. 



SPINAL CORD AND BRAIN. 



The anatomy and histology of each part of the central 

 nervous system should be mastered before its physiology is 



PONS. 



CORD. 



FIG. 77. Mesial Section through the Brain and upper part of the Spinal Cord 

 to show the positions at which the sections figured in later diagrams have 

 been made. 



studied. An outline sufficient to make the description of 

 the physiology intelligible is all that is given here. 



