470 



THE NERVOUS SYSTEM. 



C D 



FIG. 272. Four cross-sections of the human spinal cord : A, cervical region ; in the 

 plane of the sixth spinal nerve-root ; B, lumbar region ; C, thoracic region ; D, sacral 

 region ; X 7 (from preparations of H. Schmaus) (Bohm and Davidoff ). 



