FATIGUE OF SENSES 249 



centres are so fatigued that they no longer respond. 

 The cold centres, on the other hand, have had so little 

 use that they are oversensitive and respond to the slight- 

 est change of temperature. This is frequently spoken 

 of as a nervous chill and is best corrected by a course of 

 training with cold sponge baths, which serves to restore 

 the equilibrium of the oversensitive nerve ends. In 

 like manner, the nerve end organs of pain may become 

 oversensitive. This should be corrected by vigorous 

 exercise and massage. 



THE MUSCULAR SENSE 



The means by which we are enabled to judge of the 

 direction, rapidity and extent of movement, the position 

 of the moving parts, the amount of force exerted, and 

 the weight of objects lifted are grouped under the term, 

 muscular sense. They are supposed to arise from nerve 

 terminals and bodies resembling touch corpuscles in 

 the muscles, tendons and joints. 



SENSE OF PAIN 



The sensations called pain which do not arise in the 

 skin, are so general that they cannot be localized and the 

 mechanism by which they are produced is not known. 



THE SENSE OF TASTE 



End organs. The special end organs of taste differ 

 markedly from those of touch, inasmuch as they have 

 to do not with physical contact with external objects, 

 but w T ith substances in solution. The end organs of taste 

 consist of groups of specialized cells, the taste buds, 

 which are distributed over the top and sides of the 



