4 
zooLoar. 
Fig. 174.— Side view 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; N\ the brain; ee, vertebrae 
forming the solid partition between 
the dorsal and ventral cavities; 6, 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 
which one tube leads to the lungs, I, 
and another to the stomach, /; /i, the 
heart; k, 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. 
