Question

the descriptive system that has the umbilical region in the middle of the diagram is the ______ region descriptive system. fifteen four nine

Explanation:

In the nine - region descriptive system of the abdomen, the umbilical region is in the middle. The four - region system has four quadrants and the umbilical region is not in the middle in a four - region context. And fifteen is not a standard number for such a basic abdominal region descriptive system.

Answer:

nine