TOUCH, PRESSURE, AND LOCATION 



353 



meter of skin, while in the middle of the foot-sole there are about two 

 in this unit of area. The spherical end-bulbs of Krause are of a similar 

 general structure to the preceding. (See Fig. 215.) They are, however, 

 shaped somewhat differently, being spherical, oval, or pear-shaped. They 

 are located more deeply than the preceding sort of end-organ. The cylin- 

 drical end-bulbs of Krause were described on page 330, which see. The 

 Pacinian corpuscles, of which there are many varieties, have also been 



FIG. 203 



a' 



A Meissner corpuscle: a and a , are nerve-fibers which break up above into a complicated 

 system of loops and knoblets. The whole is surrounded by connective-tissue lamellae, inside the 

 papillee. Rows of these make up the lines on the finger-ends, etc. (Probably the end-organ 

 of gross touch.) 



described under the head of muscle-sense organs. (See page 330.) 

 These are apparently the most elaborate of the tactile organs, and are 

 often large enough to be seen with the naked eye. The Vater-Pacinian 

 corpuscle, the corpuscle of Herbst, and the Golgi-Mazzoni corpuscle 

 are various forms of these last, and differ chiefly in the structure of the 

 core and in the relative thickness of the transmitting mechanism around 

 it. The elastic-tissue spindles (Ruffini) are found in the corium and 

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