STRUCTURE OF THE PAPILLA. 



425 



from the ultimate ramifications of the cutaneous plexus, 



on which their exquisite sensibility depends. The exact 



mode in which these nerve- fibres terminate is not yet 



Fig. 105.* 



satisfactorily determined. In some parts, especially those 

 in which the sense of touch is highly developed, as for 

 example, the palm of the hand and the lips, the fibres 

 appear to terminate, in many of the papillae, by one or 

 more free ends in the substance of a dilated oval-shaped 

 body, not unlike a Pacinian corpuscle (figs. 129, 130), 



* Fig. 105. Vertical section of the skin and subcutaneous tissue, from 

 end of the thumb, across the ridges and furrows, magnified 20 diameters 

 (from Kolliker) ; a, horny, and b, mucous layer of the epidermis ; 

 c, corium ; d, panniculus adiposus ; e, papillse on the ridges ; /, fat 

 clusters ; ff, sweat-glands ; h, sweat-ducts ; i, their openings on the 

 surface. 



