128 



SPECIAL HISTOLOGY. 



plexus lying immediately under the surface covered by the epidermis, 

 and which is composed of larger vessels (of O'Ol 0*005 of a line) with 



Fig. 52. 



53 - 



wide, and of capillaries (of 0-003-0-005 of aline) with narrow meshes ; and 



secondly, of very many separate 

 loops of the finest vessels (0-003 

 0'004 of a line) which are given 

 off to the papillce. With cer- 

 tain exceptions (v. 37) every 

 papilla possesses its own capil- 

 lary loop (Fig. 53),. (the branched 

 papillce have many), which runs 

 either' in the axis of the papilla 

 or near the surface, almost as 

 far as its apex. 



The larger trunks of the lym- 

 phatic vessels are very easily recognizable in the subcutaneous cellular 

 tissue, and are very numerous. In the corium itself different anatomists, 

 Hasse, Lauth, Fohmann, &c., have demonstrated the lymphatics by in- 

 jecting them with quicksilver. All agree in this, that they form an ex- 

 cessively close network of fine vessels in its outermost part, according 

 to Krause (1. c., p. Ill) of j 5 -^o of a line in diameter; the meshes of 

 which become wider internally, and finally open by single trunks into 

 the vessels of the subcutaneous cellular tissue. However, it is not by 

 any means known, whether the vessels composing these plexuses are 

 really the true commencement of the cutaneous lymphatics. 



FIG. 52. Vessels of the fat-cells. J$. Vessels of a small fat lobule ; a, artery ; b, vein. 

 JB. Three fat-cells with their capillaries more magnified : after Todd and Bowman. Magni- 

 fied 100 diameters. 



FiG. 53. Vessels of \\iepapillce of one entire and two half ridges of the cutis 5 after Berres. 



