188 



OF ABSORPTION AND SANGUIFICATION. 



more deeply situated in the suhmucous areolar tissue (Fig. 76, c), and con- 

 stitute the so-called Rete amp him. Besides these plexuses, Auerbach 1 has 

 more recently called attention to other plexuses of lymphatics, situated in 

 and between the muscular coats of the intestines. In the longitudinal mus- 

 cular layer one such plexus, and in the circular layer several may be found, 

 to which he has applied the name of interfascicular capillaries of the lym- 

 phatics, and all of which pour their contents into a median system of larger 

 channels, possessing valves, and occupying the space between the circular 

 and longitudinal muscular coats, which he has termed the interlaminar net- 

 work. This last he considers represents the subserous or subperitoneal layer 

 of other observers, a layer which is only present at and in the immediate 



FIG. 75. 



R 



A, Villi of Man, injected, showing the bloodvesse's, an 1 the lacteals. B, Villus of a Sheep. 



vicinity of the attachment of the mesentery. Some of the finest of these 

 capillary lymphatics appear to have no other parietes than such as may be 

 .formed by the adhesion of a single layer of sinuously-contoured tessellated 

 epithelium-cells. In addition to the central lacteal, each villus is composed 

 ot a matrix of areolar tissue,' 2 without any intermixture of elastic fibres, 

 containing in its interstices numerous branched and communicating cells 

 with nuclei, and frequently also fat-granules in their interior. The arrange- 

 ment of the bloodvessels, according to Heller,' 1 is that in man every villus 

 contains an artery, which begins to lose itself in a capillary plexus, about 



1 Sn-lmM and Kollikor, Zeits. f. Wiss. Zool., Band xv, 1865, p. 



Kiillikcr, Manual of Human Histology, p. 32-3. 

 1 Lud wi's Arin 



127. 



Lud wig's Arbeitcn, Band vii. 



