The secondary retroperitoneal organs, which were initially intraperitoneal and became retroperitoneal structures during embryologic development due to the regression of peritoneal tissue lying on the posterior wall of the abdominal cavity (the mesentery of these structures fuse with the posterior abdominal wall
), are the ascending and descending colon, duodenum except the bulbus part (first half of duodenum segment 1) and pancreas.
Table 1 Surgical techniques for oophoropexy Fixation of the ovary to posterior abdominal wall
 Fixation of the ovary to pelvic side wall  Plication of the uteroovarian ligaments  Uteroovarian ligament shortening by "endoloop application"  Combined approach of fixation of the ovary and shortening of the ligament 
The development of the mesentery starts when the foregut, midgut and hindgut are in broad contact with mesenchyme of the posterior abdominal wall
in the fetus.
(1) Differential growth of the posterior abdominal wall
Its normal position is provided by two fatty ligaments: the gastrosplenic ligament, which connects the greater curvature of the stomach to the ventral aspect of the spleen, and the splenorenal ligament between the left kidney and the spleen, attaching the spleen to the posterior abdominal wall
. The splenic hilum is directed anteromedially and includes splenic artery and six or more branches of the splenic vein.
The reasons for this herniation remain unclear, although several predisposing factors have been postulated by Moynihan: (a) a long or excessively mobile mesentery, (b) excessively large Foramen of Winslow, (c) absence of fusion of ascending colon to posterior abdominal wall
Pus arising from the lumbar vertebrae might track into the sheath of the psoas major muscle, on the posterior abdominal wall
, and might push its way into the groin.
For vascular injury to occur (with any means of trocar insertion), the trocar not only would have to enter the peritoneal cavity but would need to pass through it entirely and impale vessels against the posterior abdominal wall
. That is not a controlled entry, but a completely uncontrolled entry, involving too much momentum and muscle strength and too little precision.
The peritoneum tends to release a fan-shaped formation, which holds the jejunum and ileum to the posterior abdominal wall
, and is composed of two layers, having a sufficient extension to allow considerable mobility to this portion of small intestine; this formation is the mesentery, which will receive the prefixes of the organ where it is attending as the case of the mesojejunum, demonstrated in Figure 5.
This trial aimed to assess the value of MRI in the differential diagnosis of chronic groin pain in athletes, a condition caused by various pathologies, the most common being posterior abdominal wall
deficiency, osteitis pubis and muscular imbalance.
Informed consent was taken and in the exploratory laparotomy, the mass adherent to the posterior abdominal wall
and surrounded by the omentum was encapsulated and resembled a stromal tumor.
Seat belt syndrome  is caused by sudden deceleration forces acting between posterior abdominal wall
and vertebra causing injury to the organs in between due to one or other mechanisms described above.