STSUCTURE OF THE VILLI. 



361 



Fig. 255. — Mag- 

 nified View op 

 THE Blood-ves- 

 sels OP THE In- 

 testinal Villi. 



The drawing was 

 taken from a pre- 

 paration injected by 

 Lieberkiilm, and 

 shows in eacli villus 

 a small artery and 

 vein with the inter- 

 mediate capillary 

 network. 



Fis. 



Fig. 256. — Injected Lacteal 

 Vessels in the Villi op the 

 Human Intestine. 



A, two villi in which the lacteals 

 are represented as filled v.-ith white 

 substance and the blood-vessels 

 v,-ith dark : 109 diameters (Teich- 

 manu). a, b, the lacteal vessels, 

 single in one villus and double in the 

 other ; c, the horizontal lacteal ves- 

 sels with which those of the villi 

 communicate ; d, the blood-vessels, 

 consisting of small arteries and veins 

 with capillary network between. 



B, injected lacteal (shaded dark) 

 in a villus, showing an example 

 not very common of a looped net- 

 work «, which is connected by a 

 single vessel with the horizontal 

 lacteal vessel b : the jireparation 

 was made from the intestine of 

 a young man who died suddenly 

 while digestion was going on : 80 

 diameters (from W. Krause). 



Fig. 257. — Vertical Section of 

 the Intestinal Mucous AIem- 



BRANE OP THE RaBBIT (slightly 



altered from Frey). ^^. 



Two villi are represented, in one 

 of which the dilated lacteal alone is 

 shown, in the other the blood- 

 vessels and lacteal are both seen 

 injected, the lacteal white, the 

 blood-vessels dark : the section is 

 carried through the tubular glands 

 into the submucous tissue : a, the 

 lacteal vessels of the villi ; a', hori- 

 zontal lacteal, which they join ; b, 

 capillary blood-vessels in one of the 

 villi ; c, small artery ; d, vein ; 

 e, the epithelium covering the 

 villi ; r/, tubular glands or crypts of 

 Lieberkiihii, some divided in the 

 middlp, others cut irregularly ; ?', 

 the submucous layer. 



A, cross section of three tubular 

 glands more highly magnified. 



Fig. 256. 



Fig. 257. 



