How are lumbar vertebrae best described?

• A. Long spinous process and short transverse process
• B. Fused together
• C. Small and boxy
• D. Short spinous process and long transverse process

Answer: (D)

Lumbar vertebrae are built to support the body's weight, so they have large, chunky bodies and projections suited for strong muscle attachments. The key description is that the spinous processes are short, while the transverse processes are long. This arrangement provides broad surfaces for muscle attachment and effective lever action for movements of the lower back, while contributing to stability. The long transverse processes and short spinous processes help distinguish them from other regions.

Describing them as long spinous processes with short transverse processes would fit the thoracic region, not the lumbar. Fused vertebrae don’t describe the typical lumbar structure, and “small and boxy” doesn’t reflect the robust lumbar bodies and projections.