420 



DIGESTIVE SYSTEM OF THE PIG 



patches and solitary glands are numerous and very distinct; the patches are usually 

 band-like and prominent; the solitary glands form projecting nodules marked })y 

 crypts. 



The large intestine is about 15 feet (ca. 4 to 5 meters) in length, and is for the 

 most part much wider than the small intestine; it is connected by a mesentery 

 with the dorsal abdominal wall between the kidneys. The caecum is cylindrical, 

 about 8 to 12 inches (ca. 20 to 30 cm.) long, and 3 to 4 inches (ca. 8 to 10 cm.) wide. 

 It lies against the upper part of the right flank, its blind end reaching to within 

 about two inches (ca. 5 cm.) of the pelvic inlet. The ileum joins the csecum 

 obliquely and projects somewhat into its lumen. The colon has at first about the 



Hepatic artery 



Hepatic duct 

 (Esophageal notch 



Fig. 322. — Livkr of Pig, Visceral Surface. 

 Photograph of specimen hardened in situ. 



same caliber as the csecum, but becomes gradually smaller. Most of it is arranged 

 in three close, double spiral coils in the mesentery, in relation chiefly to the right 

 flank externally, and to the small intestine l)ehind and to the left. On emerging 

 from this spiral labyrinth, it passes forward to the stomach and pancreas and then 

 turns backward; this terminal part is narrow, median in position, and closely 

 attached by a short mesentery to the sublumbar region. The rectum is usually 

 surrounded by a quantity of fat. The caecum has three longitudinal muscular 

 bands and three rows of sacculations, which are continued a short distance on the 

 colon. The spiral colon has two bands and two series of sacculations, which, 

 however, gradually disappear in the centrifugal part. 



