330 



THE SENSES 



Fig. 182 shows well the cylindric end-bulb of Krause. This is found 

 in cross-striated muscle and in tendon as well as in the skin and mucous 

 membranes. It consists of a thin nucleated capsule investing a semi- 

 fluid core containing the nerve-fiber. It is obvious that such an instru- 

 ment among the fibers of muscle or tendon will be stimulated when the 

 muscle hardens in contraction or when the fibrous bundles of the tendon 

 are drawn together as the tendon is put on stretch. The Vater-Pacinian 

 corpuscle -is built on the same plan as the preceding, but it is on a larger 

 scale and more elaborate. They are sometimes 3 mm. long and 1 or 2 



FIG. 182 



FIG. 183 



The cylindric end-bulbs ot Krause. The 

 ame structure is seen as in the Vater-Paci- 

 nian corpuscles, but this sense-organ is better 

 adapted to its position" between muscle-fibers. 

 These are perhaps the more passive end- 

 organs of kinesthesia. 



A Pacinian corpuscle from a cat's mesentery. 



(Von Frey.) 



broad and have as many as 60 fibrous lamellae, each of which according 

 to Schwalbe is covered on both surfaces by a layer of endothelial plates. 

 These end-organs are of many varieties and are found in many kinds of 

 places. They are in the skin especially of the foot and the hand near the 

 joints and particularly on the flexor sides of the latter, in the periosteum 

 of the bones, in the tendons of intermuscular septa, in the muscles them- 

 selves, and in the coverings of the viscera and of the nerves (Figs. 183, 184, 

 and 208). Of a different nature (and function who can doubt?) are the 

 neuro-muscular andneuro-tendinous end-organs described by Sherrington 

 and Golgi. Instead of being compact and rounded organs, these apparently 



