Which joint is located at the junction between the last lumbar vertebra and the first sacral segment?

Prepare for the Spinal Anatomy Exam III. Engage with diverse questions, hints, and in-depth explanations. Solidify your understanding of spinal anatomy concepts crucial for excelling in your exam.

Multiple Choice

Which joint is located at the junction between the last lumbar vertebra and the first sacral segment?

At the lumbosacral junction, the connection between the last lumbar vertebra and the first sacral segment is the L5–S1 facet joint. This joint is formed by the inferior articular facet of L5 and the superior articular facet of S1 and lies in the posterior elements of the spine. It is a synovial plane (zygapophysial) joint that allows small gliding movements and helps stabilize the transition from the lumbar to the sacral region. The other options don’t fit: the L4–L5 facet joint is higher up, the sacroiliac joint connects the sacrum to the ilium, and while there is an intervertebral disc between L5 and S1, the question points to the facet joint that directly articulates at this junction.

Which joint is located at the junction between the last lumbar vertebra and the first sacral segment?

Prepare for the Spinal Anatomy Exam III. Engage with diverse questions, hints, and in-depth explanations. Solidify your understanding of spinal anatomy concepts crucial for excelling in your exam.

Which joint is located at the junction between the last lumbar vertebra and the first sacral segment?

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