986 THE ORGANS OF DIGESTION. 



The layer of peritoneum covering the pancreas and attached to the spleen may 

 be called the lieno-pancreatic ligament ; it is really the anterior layer of the lieno- 

 renal ligament. 



Peritoneum of greater sac 

 Renal surface if$&^ ^-Peritoneum of lesser sac. 



^, _^-^.. . ...,,.-.....:, Gastric surface 

 Posterior border 



K'-:-'-~--:*r:'3m~ml i It il-:'v"X" S >.._'. 1 ', ' .- J 



- Anterior border 



FIG. 612. Inner surface of spleen, showing " peritoneal lines " at hilus. (From model of His.) 



We are now prepared to follow a whole layer of peritoneum instead of tracing 

 it in certain lines. 



Parietal Peritoneum. 



The wall-implanted peritoneum follows essentially the wall of the abdomen 

 and that of the pelvis, being bound firmly to the latter and quite loosely to the 

 former. In most places it possesses a greater thickness than the visceral layer 

 arid a marked resistance. A separate piece will resist a pull of about fifty 

 pounds. In the greater part of its extent it is intimately connected with the 

 endo-abdominal fascia (transversalis and iliac fascia) which covers it as does the 

 endo-thoracic fascia cover the pleura ; or as the fibrous pericardium covers the 

 serous pericardium. 



Anterior Wall of the Peritoneal Sac. 



From the umbilicus down along the inner surface of the anterior abdominal 

 wall the parietal layer descends to the top of the bladder and Poupart's ligaments, 

 and extends from here into the pelvis. In its course it is thin on the linea alba 

 and umbilicus, and is fused with the parts beneath. On both sides of the linea 

 alba, especially below in the pubic region, and close above Poupart's ligaments, 

 the peritoneum is thicker and does not lie so close to the abdomiual wall, as a 

 well-developed properitoneal fatty layer comes between and separates them. 

 Higher up along the linea alba the peritoneum is rather loosely attached and 

 very often covers numerous, knobby, overlapped processes of fat which project 

 inward, plicce adiposce. 



Lower down the processes of the fatty layer project in the opposite direction 

 toward the linea alba, arid may push out through aponeurotic holes and make a 

 fat hernia of variable size. 



Above the umbilicus the peritoneum forms itself into a sheath which contains 

 the beginning of the round ligament of the liver. It forms a pocket open from 

 above which is in a position to receive a loop of intestine and to share in the for- 

 mation of an umbilical hernia. 



