Which portion of the spine is designed to support the weight of the upper body?

Which portion of the spine is designed to support the weight of the upper body?

• A. Cervical
• B. Thoracic
• C. Lumbar
• D. Sacral

Answer: (C)

The part of the spine that bears most of the upper body’s load is the lumbar region. These lower back vertebrae are the largest, with big vertebral bodies and strong discs, built to transmit and cushion the axial weight from the chest and head down into the pelvis. The lumbar spine also provides a stable base for standing, lifting, and bending, thanks to its facet joints that favor stability in flexion and extension. By contrast, the thoracic region is anchored to the rib cage and is relatively rigid, handling less axial load; the cervical region mainly supports the head and allows mobility; and the sacrum, though it transmits weight into the pelvis, is fused and oriented to transfer that load toward the hips rather than primarily bearing the upper body's weight itself. So the lumbar region is designed to support the weight of the upper body.

The part of the spine that bears most of the upper body’s load is the lumbar region. These lower back vertebrae are the largest, with big vertebral bodies and strong discs, built to transmit and cushion the axial weight from the chest and head down into the pelvis. The lumbar spine also provides a stable base for standing, lifting, and bending, thanks to its facet joints that favor stability in flexion and extension. By contrast, the thoracic region is anchored to the rib cage and is relatively rigid, handling less axial load; the cervical region mainly supports the head and allows mobility; and the sacrum, though it transmits weight into the pelvis, is fused and oriented to transfer that load toward the hips rather than primarily bearing the upper body's weight itself. So the lumbar region is designed to support the weight of the upper body.