Where is trabecular bone predominantly found?

• A. In the midshaft of long bones
• B. At the ends of long bones and in the spine
• C. In the pelvis and skull only
• D. Throughout the entire skeleton

Answer: (B)

Trabecular bone, also known as cancellous or spongy bone, is primarily found at the ends of long bones and in the vertebrae of the spine. This type of bone is characterized by its porous, lattice-like structure, which provides both strength and lightweight characteristics. The trabecular structure allows for the accommodation of various stresses and strains placed on the skeleton, commonly found in regions that experience higher levels of mechanical loading or stress, like the joints and spinal areas, where support and shock absorption are critical.

In addition to being found at the ends of long bones (epiphyses) and in the spine (vertebrae), trabecular bone is also present in other locations throughout the body, such as within the pelvis, ribs, and skull. However, the question specifically focuses on the primary locations, which are the ends of long bones and the spine, making this answer the most accurate in identifying where trabecular bone is predominantly located.