222 SKIN, HAIR, AND NAILS, BY ALFRED BIESIADECKI. 



As already stated, the coarser fasciculi of connective tissue 

 that penetrate the corium break up into more slender bundles, 

 and these again into separate fibrils. In the deeper parts of 

 the corium a few of the fasciculi decussate, and give a plexi- 

 form appearance to this part, whence it has been termed the 

 pars reticularis corii, in opposition to the upper part, or pars 

 papillaris, in which only a few of the fibres decussate. There 

 is, however, no better defined line of demarcation between 

 these parts than between the corium and the subcutaneous 

 connective tissue in those cases where the latter is destitute of 

 fat. 



Fig. 199. 



Fig. 199. Specimen prepared in chromic acid, a, Vascular, 6, 

 nervous papilla ; c, bloodvessel ; d, medullated nerve fibre, enclosed 

 in a thick nucleated sheath ; e, tactile corpuscle ; /, transversely 

 divided medullated nerve fibres. 



The surface of the corium exhibits wart-like elevations, 

 papillae, that present differences in their height and breadth at 

 different points, being sometimes villus-like or thread-shaped 

 processes of the cutis, as on the fingers, and sometimes more 

 rounded projections, as on the greater part of the rest of the 



