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Embryologic development of the mesentery, peritoneal reflection, and Toldt's fascia
Published in John Calvin Coffey, Rishabh Sehgal, Dara Walsh, Mesenteric Principles of Gastrointestinal Surgery, 2017
J. CALVIN COFFEY, RISHABH SEHGAL, JOEP KNOL
The reverse of this process may occur as follows: 1. The laminar dorsal mesentery is positioned in the midline, connected anteriorly via the vitello-intestinal duct and posteriorly via the superior and inferior mesentery vessels. 2. The hindgut mesentery and intestine elongate and then attaches to the left of the midline. 3. The midgut elongates and because of the leftsided position of the hindgut, it takes up a spiral conformation. 4. The midgut adopts a position whereby the right colon and mesentery are located on the right side, with the small bowel and mesentery centrally positioned. 5. Toldt's fascia attaches the mesentery to the posterior abdominal wall. 6. The peritoneal reflection develops to bridge any space between the intestine, mesentery, and abdominal wall (including also the greater omentum).
Applied radiological anatomy of the peritoneal cavity
Published in Wim P. Ceelen, Edward A. Levine, Intraperitoneal Cancer Therapy, 2015
Posteriorly, the dorsal mesentery connecting the pancreas to the body wall fuses with the posterior abdominal wall, to form part of the anterior pararenal space, making this a retroperitoneal organ (Figures 3.1 and 3.2).
Clinical importance of main pancreatic duct variants and possible correlation with pancreatic diseases
Published in Scandinavian Journal of Gastroenterology, 2020
Ana Dugic, Sara Nikolic, Steffen Mühldorfer, Milutin Bulajic, Raffaella Pozzi Mucelli, Apostolos V. Tsolakis, J.-Matthias Löhr, Miroslav Vujasinovic
Differentiation of pancreas begins at about 4–10 mm embryonic size, with outgrowth of dorsal and ventral bud from the primitive foregut, each having its own axial duct. Whereas the ventral anlage derives from hepatic diverticulum, the larger and more rostrally-located dorsal anlage lies in the dorsal mesentery. It is proposed that the ventral anlage consists of two buds (right and left), of which the left ventral bud usually regresses completely. Due to unequal growth of the duodenum, the right ventral bud rotates clockwise and backwards along with the common bile duct to reach its position in the dorsal mesentery, inferior and posterior to the dorsal bud. As a result, at about the 7th week of gestation, the dorsal and ventral buds fuse to form the pancreas. The dorsal bud gives rise to the tail, body, isthmus and the upper portion of the pancreatic head, whereas the ventral bud forms the lower part of the head. The origin of processus uncinatus is still disputable. While some authors state its dorsal origin, others propose its junctional origin (dorsoventral junction) [4–7].
Transmesenteric hernia: a rare case of acute abdominal pain in children: a case report and review of the literature
Published in Acta Chirurgica Belgica, 2018
Edward Willems, Bart Willaert, Sam Van Slycke
Several possible explanations of the pathogenesis of mesenteric defects have been proposed, yet the exact etiology remains uncertain up to now. The most popular theory states that relative intestinal ischemia during fetal development leads to thinning of the peritoneal layers causing the formation of a defect in the mesentery [4,5,12]. A second possible explanation suggested by Federschmidt is the partial regression of the dorsal mesentery during fetal development of the human being. Other possible theories include the rapid lengthening of a mesenterial segment, intra-uterine compression of the mesentery by the colon during midgut herniation or coalescence between two epithelial layers with insufficient connective tissue between them [13,14]. Genetic predisposition has also been suggested, since associations with other genetic diseases such as cystic fibrosis and Hirschprung’s disease and with intestinal atresia have been reported [7].
The mesentery: an ADME perspective on a ‘new’ organ
Published in Drug Metabolism Reviews, 2018
Aneesh A. Argikar, Upendra A. Argikar
The development of mesentery during and after the embryonic stage has been covered in great detail elsewhere (Martini and Tallitsch 2014). To summarize the embryonic development, the endoderm forms the hindgut and the foregut. During the initial months of the embryo, the gut is just a simple tube. This simple digestive tube is suspended by the mesentery. After gradually disappearing, the ventral mesentery remains in two places, on the ventral surface of the stomach known as lesser omentum and between the liver and anterior abdominal wall known as falciform ligament. The lesser omentum provides stability to the stomach and also provides a way for the blood vessels and other structures to enter and leave the liver. As the embryo grows, the dorsal mesentery enlarges and forms a pouch called the greater omentum. The literature on the expression of enzymes and transporters in the embryonic and fetal mesentery was not available.