ABNORMAL FEATURES IN THE PERITONEUM OF A RACCOON. 169 



12. On Abnormal Features in the Peritoneum o£ a Raccoon. 

 By 0. F. SoNNTAG, M.D., Ch.B., Anatomist to the 

 Society. 



[Received Februaiy 6, 1920 : Read February 10, 1920.] 

 (Text-figures 18 & 19.) 



Tlie conditions present in the peritoneum of this particular 

 Raccoon are extremely interesting. They consist of : — • 



1. Absence of the Foramen of Winslow. 



2. The presence of a communicati(5n between the greater and 

 lesser sacs on the inner side of the upper half of the left kidney. 



3. Subdivision of the lesser sac of peritoneum by a vertical 

 gastro-pancreatic sheet. The gastric and hepatic branches of the 

 coeliac axis artery run to the liver and stomach in this. 



4. Subdivision of the lesser sac by transverse peritoneal bands 

 running from the pancreas to the hilum of the spleen. Through 

 this the splenic vessels run. 



5. The presence of bands connecting the great omentum to the 

 abdominal viscera. 



6. The presence of a bare or non-peritoneal area in front of 

 the left kidney. 



The Lesser Omentum (text-fig. 18, no. 4). 



The lesser omentum ran from the inner sui-face of the lower 

 end of the cesophagus, the lesser curvature of the stomach, the 

 upper border of the first part of the duodenum, and the outer 

 border of the upper half of the second part of the duodenum to 

 the inferior surface of the liver and the lateral abdominal wall. 

 It was also connected below to the duodenal mesentery. To join 

 the latter it passed in a slanting direction from the outer to the 

 inner surface of the duodenum. The line it follows is shown in 

 text-fig. 18, no. 26. 



The attachment to the liver is along a, line beginning on the 

 inferior surface of the cystic lobe to the left of the fundus of the 

 gall-bladder, and runs along the inferior surface of the bladder, 

 being divided to embrace it, the portal fissure, the ridge on the 

 inner surface of the inner division of the right lateral lobe, and 

 the inferior borders of both divisions of the right lobe. 



The caudate lobe of the liver (text-fig. 18, no. 2) is seen shining 

 through the omentum, and the common bile-duct, portal vein 

 (text-fig. 18, no. 25), hepatic artery, and inferior vena cava (text- 

 fig. 18, no. 24) are included within its layers. At no point can a 

 Foramen of Winslow be detected in this region. 



The lesser omentum appears, in this case, to be formed of two 

 layers, which appear Y-shaped on cross-section, and the common 

 bile-duct (text-fig. 18, no. 3) is placed at the junction of the three 

 limbs. The two lateral limbs embrace an angle open to the left 

 (text-fig. 18, no. 5), and the arrow no. A in text-fig. 18 points 



