316 THE ADRENAL, GENERAL MOTOR, AND VAGAL SYSTEMS. 



pseudopodia, which by intermixing make up the tissue itself: 

 i.e., Kolliker's cytogenous tissue. The fenestra, or openings, 

 with which this cytogenous membrane is permeated accommo- 

 date the capillaries. 



Another histological feature of special interest is the 

 presence of smooth muscular fibers which stand upright a few 

 being horizontally disposed and are interwoven among the 

 capillaries and cell-fibers previously referred to. We thus have 

 immediately under the villus's delicate basement membrane a 



INTESTINAL, VILL.TJS; VENOUS RADICLE SHOWN AT o. (Cadiat.) 



perfect, though minute, suction-pump which by alternately 

 contracting and relaxing causes the organ to absorb the pre- 

 viously asepticized intestinal fluids. 



Next in order inwardly are the venous stems (one or two) 

 which carry the blood from the villous capillaries to the veins 

 in the deeper tissues. These vascular channels, which carry 

 the bulk of intestinal foodstuffs to veins which ultimately end 

 in the portal system, are well shown in the annexed cut, and 

 will again be referred to. 



Last of all, in the middle of the organ, is the lacteal, a 



