In the posterior maxilla, marrow spaces are what compared to the anterior maxilla?

• A. Slightly smaller.
• B. Slightly larger.
• C. The same size.
• D. There are no marrow spaces.

Answer: (B)

In the maxilla, the amount and size of cancellous bone marrow spaces vary by region. The posterior part contains more porous cancellous bone with larger marrow cavities than the anterior region, which tends to be denser. That means the marrow spaces in the posterior maxilla are slightly larger than those in the anterior maxilla.