134 



zooLoar. 



Fig, 174.— SiOe view of 

 the vertebral coluiiin 

 or back-bone of man. 

 From Martin. 



FiG. 175.— Diaprrammatic longitudinal 

 section of tlie body, a, the neural 

 tube, with its upper enlargement in 

 the skull cavity at a'; N, the spinal 

 cord; N', the brain; ee, vertebras 

 forming the solid partition between 

 the dorsal and ventral cavities; b, the 

 pleural, andc. 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 

 whicli one tube leads to the lungs, I, 

 and another to the stomach, /; /i, the 

 heart; k, a kidney; s, the sympathetic 

 nervous cliain. From tlie stomach./, 

 the intestinal tube leads through the 

 ab<l(iminal cavity to the posterior 

 openmg of the alimentary canal. 



