100 



THE HUMAN MOTOR 



FK>. 107. 



Nervous cell with its prolongations (a neuron). 



The resistance of nerves is great, needing 25 kilogrammes to 

 break the ulnar, 55 the sciatic nerve ; R = 2 to 3 kilogrammes 

 per square millimetre. The modulus is 10'9 (Wertheim). It is 

 interesting to note that the nerves, of all the organs, are the best 

 conductors of electricity, for in taking 100 as the conductivity 

 K of muscles : 



Muscles 

 Nerves 



K. K. 



100 Tendons 30 



588 Bones 7 



73. Conclusions. The elastic properties of the organic tissues 

 may be compared with those of other substances such as india- 

 rubber : 



