Anatomy of Lumbar Vertebrae Features
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Questions and Answers

What is the main function of the sacral hiatus?

  • To allow the spinal nerves to exit (correct)
  • To prevent anterior translation of L5 over S1
  • To articulate with the coccyx
  • To form the posterior sacral foraminae

    • Which lumbar vertebrae have a coronal orientation of facet joints?

  • L3-L4
  • L1-L3
  • L5-S1 (correct)
  • L4-L5

    • What is the typical shape of the IV disc at L4-L5 and L5-S1?

  • Thicker posteriorly
  • Triangular
  • Wedge-shaped (correct)
  • Thinner anteriorly

    • What is the main function of the posterior sacroiliac ligament?

    <p>To support the sacroiliac joint</p> Signup and view all the answers

    Why does the lumbar spine have sagittal-oriented facets in upper lumbar vertebrae?

    <p>To give flexibility during flexion and extension</p> Signup and view all the answers

    What causes instability in pelvic fractures according to the text?

    <p>Disruption of the posterior sacroiliac ligament</p> Signup and view all the answers

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