Final answer:
The lesser omentum is attached to the lesser curvature of the stomach, which is the concave medial border of the stomach.
Step-by-step explanation:
The lesser omentum is attached to the lesser curvature of the stomach. This is the concave medial border of the stomach which the lesser omentum extends from the liver to. The larger, convex lateral surface is known as the greater curvature, and to this attaches the greater omentum, running down to the posterior abdominal wall. The lesser omentum's role is to hold the stomach in place and is one of the peritoneal folds that also serves as a pathway for blood vessels and other structures to enter the liver.