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 ; (7, thoracic region j D, sacral 

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



