Final answer:
The central region within the 9-region plan of abdominal division is called the epigastric region. It is located in the upper part of the abdominal cavity, between the right and left hypochondriac regions.
Step-by-step explanation:
The central region within the 9-region plan of abdominal division is called the epigastric region. It is located in the upper part of the abdominal cavity, between the right and left hypochondriac regions. This region contains important structures such as the stomach, liver, and gallbladder.