Final answer:
The greater curvature of the stomach is the convex lateral surface, while the lesser curvature is the concave medial border. The wall of the stomach has four layers, including the muscularis with an inner oblique smooth muscle layer that enables the stomach to churn and mix food.
Step-by-step explanation:
The greater curvature is the convex lateral surface of the stomach, while the concave medial border is the lesser curvature. The stomach is held in place by the lesser omentum, which extends from the liver to the lesser curvature, and the greater omentum, which runs from the greater curvature to the posterior abdominal wall. The wall of the stomach is made up of four layers, including the muscularis that has an inner oblique smooth muscle layer. This layer allows the stomach to vigorously churn and mix food.