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HANDBOOK OF PHYSIOLOGY. 



others a nerve after passing unaltered through one, has been observed to 

 terminate in a second Pacinian corpuscle. The physiological import of 

 these bodies is still obscure. 



FIG. 320. 



FIG. 321. 



FIG. 322. 



FIG. 320. Summit of a Pacinian corpuscle of the human finger, showing the endothelial mem- 

 branes lining the capsules, x 200. (Klein and Noble Smith.) 



FIG. 321. A corpuscle of Herbst, from the tongue of a duck, a, medullated nerve cut away. 

 (Klein.) 



FIG. 322. End-bulb of Krause. a, medullated nerve-fibre; 6, capsule of corpuscle. 



(2.) The corpuscles of Herbst (Rig. 321) are closely allied to Pacinian 

 corpuscles, except that they are smaller and longer, with a row of nu- 



FIG. 323. Papillae from the skin of the hand, freed from the cuticle and exhibiting tactile 

 corpuscles. A. Simple papilla with four nerve-fibres; a, tactile corpuscles; 6, nerves. B. Papilla 

 treated with acetic acid; a, cortical layer with cells and fine elastic filaments; 6, tactile corpuscle 

 with transverse nuclei; c, entering nerve with neurilemma or perineurium; d, nerve-fibres winding 

 round the corpuscle, x 350. (Kolliker.) 



clei around the central termination of the nerve in the core. They have 

 been found chiefly in the tongues of ducks. The capsules are nearer 



