ARCHITECTURE. 



193 



sion may be roughly described as the result of passing 

 a plane through the medullary tube in such a way as to 



uSO 



u i yiymn ixna xawvins v 17 ran r-araiziYiyinii 



FlG. 33. Diagram to show in square millimeters the areas of the 

 sensory and motor nerves of the entire nervous system. The 

 motor nerves are represented by the broken line, the sensory 

 by the solid line. At the right the numerical designations for 

 the sensory cranial nerves are put on the curve. The area of 

 the sensory nerves is regularly greater than that of the motor, 

 and proportionately increased towards the head end. (The 

 curve for the spinal nerves is based on figures by Stilling.) 



separate the ventral from the dorsal portion. The idea 



13 



