724 



PHYSIOLOGY. 



to overcome resistance. Consciousness is a large factor in this last 

 function, for by it the individual judges the amount of resistance. 

 He then voluntarily regulates the amount of muscular effort. 



It is by the sum of all the sensations from the nerves of general 

 sensibility, as well as the sensation produced by muscular movement, 

 that individuals feel that they exist. With these data the individual 

 recognizes the state of different parts of his body, whether in repose 

 or activity. 



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Fig. 294. Cross-section of Neurotendinous Nerve End-organ of Rabbit 

 from Tissue Stained in Methylene Blue. (HUBER and DEWITT.) 



m, Muscle fibers, t, Tendon, c, Capsule of neuro-tendinous end-organ. 

 mn, Medullated nerve fiber. 



Laws of Sensation. Special sensations are subject to the fol- 

 lowing laws : 



1. For every nerve of sense there is a rominal degree or limit of 

 stimulus which gives no sensation whatever. There is also a max- 

 imum degree beyond which an increase of the intensity of the stim- 

 ulus brings on pain or an unpleasant sensation. 



