The Abdominal Viscera 



In pi. I are shown the parts that are visible upon the removal of 

 the right lateral wall of the abdomen and the intercostal muscles, as shown 

 in the drawing. The right kidney, however, is visible only after the peri- 

 toneum and surrounding fat have been removed. In this specimen a much 

 smaller portion of the pancreas showed through the peritonetim than was 

 visible in the specimen from which PL X was made. 



The greater omentum conceals all of the small intestine, on the right side, 

 with the exception of a portion of the duodenum and some of the coils of the 

 small intestine caudal to the free or unattached caudal border of the greater 

 omentum, PI. I. The omentum is not a delicate lacelike structure as in 

 the horse, but is comparatively thick and strong and contains a relatively 

 large amount of fat. The greater omentum forms a kind of double-walled 

 sac -like structure interposed between the abdominal viscera and the ventro- 

 lateral walls of the abdomen, PI. I. It may be divided into a parietal or 

 superficial and a visceral or deep portion, each of which is made up of two 

 layers or thicknesses of peritoneum, PI. II, 19; PI. Ill, 35, 36. The parietal 

 or superficial portion extends from the left face of the rumen, a little dorsal 

 to the left longitudinal groove, ventrally between the ventral sac of the rumen 

 and the abdominal floor, to the right side, where it turns dorsally and is at- 

 tached to the duodenum as far back as to the pelvic (caudal or iliac) flexure. 

 Pis. I, III ; this part of the omentum is also attached to the greater curva- 

 ture of the abomasum. The visceral, inner, or deep portion of the greater 

 omentum is attached to the right or visceral face of the rumen, 4 to 6 cm. 

 ventral to the right longitudinal groove, PI. IV. From here it extends 

 ventrally between the rumen and the intestines to the floor of the abdo- 

 men, where it turns to the right and then passes dorsally and has these 

 further attachments (a) to the duodenum for a short distance proximal 

 to its pelvic or caudal flexure ; {b) to the medial layer of the mesoduo- 

 denum ; (c) to the first part of the large intestine as far caudal as to the 

 point where it begins to turn cephalad ; {d) to the visceral surface of the 

 liver. 



The lesser omentum is attached to the visceral surface of the liver, to the 

 right face of the omasum, near and approximately parallel to the groove 

 between the omasiim and the reticulum, to the pyloric portion of the lesser 



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