American Academy of Professional Coders (AAPC) Practice Exam

Which classification covers bones that are shaped like cubes?

1. Long bones

2. Cuboidal bones

3. Seasmoid bones

4. Tubular bones

The correct answer is: Cuboidal bones

The classification that covers bones shaped like cubes is correct in identifying them as cuboidal bones. These bones are typically found in areas like the wrist (carpals) and the ankle (tarsals), where their cube-like shape allows for a range of motion and stability in joints. Their dimensions are approximately equal in length, width, and height, which distinguishes them from other types of bones that have different shapes and functions. Long bones, such as the femur and humerus, are characterized by their elongated shape, which is suitable for supporting weight and facilitating movement. Sesamoid bones, on the other hand, are small, round bones that form within tendons and are often found in locations such as the knee (patella). Tubular bones, which encompass long bones, have a more cylindrical structure rather than a cuboidal shape. Understanding these distinctions helps clarify why cuboidal bones are appropriately classified as such.