Question

which is the least mobile region of the vertebral column?
○ lumbar
○ thoracic
○ cervical
○ thoracolumbar

Explanation:

The vertebral column has different regions: Cervical (most mobile, allows head movement), Lumbar (mobile for trunk flexion/extension), Thoracic (attached to ribs, forming the ribcage, which restricts its mobility), and Thoracolumbar is a transition area. Among these, the Thoracic region is the least mobile due to its connection to the ribcage, limiting movement.

Answer:

B. Thoracic