Anatomy of the Lumbar Spine
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Questions and Answers

What is the purpose of the lordotic framework of the lumbar spine?

  • To assist with flexibility and increase shock absorption (correct)
  • To restrict flexibility and minimize shock absorption
  • To increase flexibility and decrease shock absorption
  • To cause rigidity and reduce shock absorption
  • What percentage of the population has a transitional vertebrae in the lumbar spine?

  • 50% to 60%
  • 10% to 15%
  • 3% to 35% (correct)
  • 20% to 30%
  • Which part of the lumbar vertebrae increases in size as you travel caudally in the spine?

  • The transverse process
  • The vertebral body (correct)
  • The neural arch
  • The posterior elements
  • What is the most frequent site of mechanical failure of the pars interarticularis?

    <p>Pars interarticularis</p> Signup and view all the answers

    What part of the vertebrae is more wedge-shaped, taller anteriorly, and helps to create the normal lumbar lordosis?

    <p>Pedicles</p> Signup and view all the answers

    Where are stress fractures (spondylolysis) most likely to occur due to large bending forces?

    <p>Pars interarticularis</p> Signup and view all the answers

    What part of the vertebrae creates the zygapophyseal joints?

    <p>Articular processes</p> Signup and view all the answers

    In the mechanism of weight transmission in an intervertebral disk, what prevents the nucleus pulposus from expanding radially?

    <p>Tension in the annulus fibrosus</p> Signup and view all the answers

    What decreases the forces on the lumbar spine when lifting a load?

    <p>Lifting the load close to your body</p> Signup and view all the answers

    Which direction of joint articulation primarily allows flexion and extension in the lumbar facet joints?

    <p>Sagittal plane</p> Signup and view all the answers

    In which levels of the spine does the majority of spinal flexion and extension occur?

    <p>L4–L5 and L5–S1</p> Signup and view all the answers

    What limits torsional stress on the lumbar disks?

    <p>Rotation allowed by the lumbar facet joints</p> Signup and view all the answers

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