NERVE-ENDINGS. 311 



Herbst's corpuscles (Fig. 234) are found, like Grandry's 

 corpuscles, usually in the skin of aquatic birds. They are 

 ovoid bodies, about 140 {i long and 80 ^ wide. The inner part 

 contains an axis cyclinder thickened at the end, and surrounded 

 by the inner sheath. The latter possesses a series of cells on its 

 outer surface, which seem to have the same function as the 

 tactile cells in MerkeFs corpuscles. The outer lamellated part 

 consists of numerous concentrically arranged connective-tissue 

 lamellae, of which the outer contain a few flat cells. The nerve 

 fibre enters at the end of the corpuscle, and passes together 

 with the Schwann's sheath and medullary sheath through the 

 outer lamellated part. Both layers end at the boundary be- 

 tween the inner sheath and the lamellae. 



FIG. 235. 



j? ' x ' ^ "^ " v * ^. Nucleus 



1 , ' :^^^ \''' -A 



Trausverse section of a Vater-Pacinian corpuscle from a cat. In the centre lies the axis 



cylinder cut across. X 200. 



The Vater-Pacinian corpuscles (Fig. 235) are slightly 

 different from those of Herbst, Instead of the large tactile 

 cells surrounding the core, we find a series of flat cells. The 

 lamellated part is developed more strongly, and in a large 



