What is the main load-bearing portion of a vertebra?

• A. Vertebral Arch
• B. Spinal Foramen
• C. Body
• D. Facet Joints

Answer: (C)

Under axial loading, the vertebral body is the primary structure that carries the majority of the spine’s compressive forces. It’s the thick, anterior portion made to withstand weight, with a cancellous interior and a surrounding cortical shell, interfacing with the intervertebral disc via the endplates. The disk distributes load into the bodies above and below, making the body the main load-bearing element.

The vertebral arch, including the pedicles and laminae, protects the spinal cord and provides attachment sites for muscles and ligaments, but it isn’t where most compression is carried. The spinal foramen is simply the opening through which the spinal cord/nerves pass, not a load-bearing structure. The facet joints guide movement and contribute to stability, yet they bear less axial load compared with the vertebral body.