Final answer:
The student seems to have asked about tooth occlusion, which is unrelated to the provided reference about abdominal cavity subdivision. The abdominal cavity can be divided into nine regions or four quadrants, with the latter being more commonly used in medical practice.
Step-by-step explanation:
The ideal anatomy of Andrew's six keys of occlusion relates to the optimal alignment and interaction of teeth, which is not directly connected to the division of the abdominal cavity. However, since the student's question seems misplaced, we can provide information on the subdivision of the abdominal cavity instead, commonly used in medicine. The abdominal cavity can be divided using two methods.
The first is the detailed regional approach that creates nine regions with one horizontal line below the ribs and another above the pelvis, and two vertical lines from the midpoints of the clavicles. The second, simpler method is the quadrants approach, which uses one horizontal and one vertical line intersecting at the umbilicus (navel) dividing the cavity into four quadrants. This method is prevalent in medical examinations and diagnostics.