300 



NERVE-TISSUE. 



axis-cylinder terminates as a knob. Longworth found them in 

 some conjunctivas, but not in all, and saw their interiors filled 

 with nucleated corpuscles. Waldeyer considers these bodies to 

 be intermediate formations between the tactile and the Pacinian 

 corpuscles. 



The corpuscles of Pacini (discovered by Vater in 1741) are 

 found in the subcutaneous tissue of the nipple, the palm of the 

 hand, and the labia majora, in the periosteum, the mesentery, 

 especially along the branches of the sympathetic nerve, and in 

 many other places. They are oval or pear-shaped bodies, com- 

 posed of numerous concentric strata, exhibiting nuclei. The 

 medullated nerve-fiber upon entering this body becomes destitute 



FIG. 128. TERMINAL PLEXUS OF NON-MEDULLATED NERVES, BENEATH 

 THE EPITHELIAL LAYER OF THE CORNEA OF A BULL. 



N, non-medullated nerve-fibers, partly with a delicate reticular, partly with a lumpy, 

 structure ; G, ganglionic enlargement ; E, columnar epithelia, in top view. Magnified 600 

 diameters. 



of its myeline, and terminates in a knob or a chain of granules. 

 Sometimes two nerve-fibers pass into the corpuscle. The signifi- 

 cance of these formations is not understood. 



(I) Termination of Non-medullated Nerve-fibers. The most 

 common termination of nerve filaments is a plexus, in which, as 

 a rule, ganglionic elements are found as nodular points of inter- 



