Free A Spinal Exam 4 Practice

In which regions is the interspinous ligament poorly developed?

Cervical and thoracic regions Lumbar and sacral regions Cervical and lumbar regions Thoracic and lumbar regions

Correct Answer:

Lumbar and sacral regions

Explanation:

Interspinous ligaments vary along the spine according to how each region moves and fuses. In the sacral region the spinous processes are fused into a single rigid structure, leaving little space and need for separate interspinous connections, so these ligaments are poorly developed there. In the lumbar region, despite its mobility, the posterior stabilization comes mainly from other structures like the facet joints and the broader posterior ligamentous complex, so the interspinous component is relatively less developed compared with regions that rely more on it. Together these patterns explain why this pair of regions shows poorer development of the interspinous ligament.

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