134 



zooioar. 



SI 



Fig. 174.— Side virw of 

 the vertebral column 

 or back-bone of man. 

 From Martin. 



FiG. 175.— Diagrammatic longitudinal 

 section of the body, a, the neural 

 tube, with its upper enlargement in 

 the skull cavity at a'; N. the spinal 

 cord; HP, the brain; ee, vertebras 

 forming the solid partition between 

 the dorsal and ventral cavities; b, the 

 pleural, and c. the abdominal divisions 

 of the ventral cavity, separated from 

 one another by the diaphragm, d; i, 

 the nasal, and o, the mouth chamber, 

 opening behind into the pharynx, from 

 which one tube leads to the lungs, I, 

 and another to the stomach,/; A. the 

 heart; fc, a kidney; s, the sympathetic 

 nervous chain. From the stomach. /, 

 the intestinal tube leads through the 

 abdominal cavity to the posterior 

 opening of the alimentary canal. 



