SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 265 



FIG. 184. 



Fig. 184 repre- 

 sents, 8, a cluster 

 of Pacinian bod- 

 ies : 1, much mag- 

 nified body ; 2, 

 pedicle; 3, por- 

 tion of nerve ; 4, 

 several nerve-fi- 

 bres ; 5, sinewy 

 sheath ; 6, nerve 

 filament; 7, its 

 axis. 



615. TACTILE CORPUSCLES are very small, composed 

 of membrane filled with granular matter, connected with, 

 usually, two, but sometimes only one, or even three or 

 four, nerve filaments. They exist in the papillae of touch 

 of the hands and feet. 



616. THE CORPUSCLES OF KRAUSE are still smaller 

 spherical bodies filled with a transparent soft substance, 

 with one or two nerve filaments entering them. 



617. ALL THESE BODIES are supposed to be concern- 

 ed in the production of sensation, but how, is a question. 



618. Remark. It is not certain that all the methods of termination 

 of the nerves are known. 



619. THE NERVES EXTEND BETWEEN THEIR ORIGIN 

 AND TERMINATION by the most direct course, which is 

 shown by the figures. 



620. THE NERVES WILL TOLERATE considerable ex- 

 tension without injury, are readily repaired when in- 

 jured ; and when even a section is made, or a portion 

 removed of considerable extent, they will be repaired in 

 a short time. 



621. THEY ARE PASSIVE AGENTS, like telegraph 

 wires, for the transmission of influences ; and whether 

 the influence in passing through them necessitates a 

 change in their constitution, or leaves them unaffected, 

 is not known, nor can it be ascertained at present how 



Describe Fig. 184. 615. What are ? 616. What are ? 617. What said of? 

 619. How do ? 620. What will ? 621. How are nerves ? 

 12 



