Question

Which of the following structures develops from the dorsal mesentery?

• A. Greater omentum
• B. Lesser omentum
• C. Liver
• D. Diaphragm

Hint:

Dorsal mesogastrium balloons into this apron over the gut.

Answer 1

The Correct Option is A

Step 1: The primitive gut tube is suspended by a dorsal mesentery (present along its whole length) and a ventral mesentery (only in the foregut region). Each gives rise to specific adult peritoneal structures.
Step 2: At the stomach the dorsal mesentery is the dorsal mesogastrium. It balloons out as the stomach rotates and forms the greater omentum (and the gastrosplenic and splenorenal ligaments). So (a) is derived from the dorsal mesentery.
Step 3: The lesser omentum (b) and the liver (c) arise from the ventral mesentery (septum transversum / ventral mesogastrium), not the dorsal mesentery.
Step 4: The diaphragm (d) develops from the septum transversum, pleuroperitoneal membranes, body wall, and oesophageal mesentery - not the dorsal mesentery. Hence the answer is (a) Greater omentum.