ORGANS OF DIGESTION. 119 
barely apparent to the naked eye, projecting into the lumen 
for the purpose of absorbing the nutriment from the chyle. 
They consist of a covering of columnar epithelial cells (Fig. 
65), within which ends a chyle vessel or Jacteal surrounded 
by small blood-vessels held in place by connective tissue. 
The fatty portions of the food are carried by the lacteals 
(Fig. 65) to the left thoracic duct, and thence to the jugu- 
lar vein, while other portions of the food are taken up by 
the capillaries of the portal system, which begin in the villi 
(Fig. 65). The mucous membrane of the large intestine 
Fic. 64. CRoSs-SECTION 
OF THE SMALL INTES- 
TINE. X 5. 
Fic. 65a. DracRAM OF A SMALL CUBE CUT 
ex, Longitudinal muscu- 
; J FROM THE WALL OF THE JEJUNUM. 
lar coat; m, circular 
muscular coat; mu, a, Mouth of intestinal or Lieberkthn’s 
mucous coat; /b, glands glands; b, one of the nine villi cut open 
of Lieberktthn; — se, showing the network of capillaries and 
serous or_ peritoneal central white lacteal within; e, lacteal; 
coat; sm, submucous 1, intestinal glands; m, artery; v, vein; 
or areolar coat. 1 and t, muscular coats. 
likewise contains tube-like glands similar to the glands of 
Lieberktthn, but no villi. 
