Mesogastria

Mesogastria refers to the peritoneal mesenteries that suspend the stomach during embryonic development. In humans, the stomach is initially connected to the posterior and anterior abdominal walls by two mesenteric folds—the dorsal and ventral mesogastria—derived from the foregut mesentery. These structures organize as the stomach rotates and the peritoneal cavity assumes its adult arrangement.

The dorsal mesogastrium attaches the stomach to the posterior abdominal wall. As development progresses, it gives rise to the greater omentum, which hangs from the greater curvature and drapes over the intestines. It also contributes to the gastrosplenic ligament and the splenorenal ligament, linking the stomach, spleen, and posterior abdominal structures. The dorsal mesogastrium thus helps anchor the stomach while allowing contact with the posterior peritoneal cavity.

The ventral mesogastrium connects the stomach to the liver and forms the components of the lesser omentum, including the hepatogastric and hepatoduodenal ligaments. It also contributes to the formation of the falciform ligament, which anchors the liver to the anterior abdominal wall. During gastric rotation, these mesogastric structures are repositioned and reorganized, yielding the adult peritoneal ligaments that connect the stomach and adjacent organs.

Clinically, remnants or malformations of these mesenteries can influence peritoneal reflections and organ positioning, and may participate in conditions involving peritoneal bands or internal hernias. In summary, mesogastria are embryonic suspensory structures that underpin the stomach’s connections, most notably forming the greater and lesser omenta and related ligaments.