NEEVE-TISSUE. 



299 



nerves, which have become destitute of their myeline investment 

 upon approaching the periphery, or they are non-medullated ? 

 sympathetic nerve-fibers. 



(a) Termination of Medullated Nerve-fibers. 



The motor Mil of nerves controlling the action of muscles (see 

 chapter on muscle tissue). 



The tactile corpuscles of Merlcel in the web of the feet of 

 water-birds, in the trunk of the pig, etc. These are finely granu- 

 lar, distinctly nucleated, globular bodies, into, which the axis- 

 cylinder penetrates, and which are located in the upper layers of 

 the derma or in the epithelium f. i., in that of the external root- 

 sheath of the tactile hairs. Sometimes two or more such corpus- 

 cles are attached to the medullated nerve-fiber. 



The tactile corpuscles of Meissner or Wagner are present in the 

 papillae of the derma of the skin, often below the level of the 



FIG. 127. MEDULLATED AND NON-MEDULLATED NERVE-FIBERS 

 FROM THE RETINA OF A BULL. 



S l , myeline sheath, with oblong nuclei and Y# 2 ) transverse septa. The myeline oozed out. 

 N, non-medullatecl nerve-fibers, with varicose enlargements. Magnified 600 diameters. 



papillae, and especially numerous in the tips of the fingers and 

 toes. These are ovoid or globular formations, with transverse or 

 spiral striations and oblong nuclei arranged in the direction of 

 the striations. One or more medullated nerve-fibers enter the 

 corpuscle at one pole. Sometimes two or more such corpuscles 

 are clustered together ; but the way in which the termination of 

 the axis-cylinder is effected is unknown. 



The bulbs of Krause are found in the conjunctiva, in the 

 mucous membrane of the floor of the mouth and of the lips, of 

 the soft palate and the tongue, in the glans penis and in the cli- 

 toris. They are ovoid or mulberry-shaped bodies, in which the 



