7 6 



CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES 



small cells. The nerve fiber penetrates the corpuscles, loses its myelin 

 sheath, and divides and subdivides to form a series of arborizations. The 

 terminal arborizations occupy the central part of the corpuscle, and are 



FIG. 102. Tactile Corpuscle of Meissner, Tactile Cell, and Free Nerve Ending. 

 (Merkel-Henle.) a. Corpuscle proper, outside of which is seen the connective-tissue 

 capsule; b, fiber ending on tactile cell; c, fiber ending freely among the epithelial cells. 



surrounded by a great number of marginal cells. The tactile corpuscles 

 of Meissner serve for the special purpose of touch. 



The Corpuscles of Krause or End-bulbs. These exist in great 



I,... 



FIG. 103. FIG. 104. 



FIG. 103. End-bulb of Krause. a, Medullated nerve fiber; &, capsule of corpuscle. 

 FIG. 104. A Termination of a Medullated Nerve Fiber in Tendon, lower half with 

 Convoluted Medullated Nerve Fiber. (Golgi.) 



numbers in the conjunctiva, the glans penis, clitoris, lips, skin, and in tendon 

 of man. They resemble the corpuscles of Pacini, but have much fewer 

 concentric layers to the corpuscle, and contain a relatively voluminous central 



