12 Questions
What is the function of the lordotic framework of the lumbar spine?
To increase flexibility and shock absorption
What percentage of the population has a transitional vertebrae in the lumbar spine?
3% to 35%
What are the components of the lumbar vertebrae?
Vertebral body, neural arch, posterior elements
Which part of the lumbar spine increases in size as you travel caudally in the spine?
Vertebral body
What is the function of the wedge shape of the lower three vertebrae?
To create the normal lumbar lordosis
Which part of the vertebra is the site of stress fractures (spondylolysis) due to large bending forces?
Pars interarticularis
What structures create the zygapophyseal joints between adjacent vertebrae?
Articular processes
How do the vertebral end plates bear weight in the intervertebral disk mechanism?
Through nuclear pressure exerted on the annulus fibrosus
What decreases the forces on the lumbar spine when lifting?
Bending the back and keeping the load close to the chest
What primarily allows flexion and extension in the lumbar facet joints?
Alignment and direction of joint articulation
Where does the majority of spinal flexion and extension occur?
L4-L5 and L5-S1 levels
What type of motion is limited by the lumbar facet joints?
Rotation
Explore and test your knowledge of the typical lordotic framework and anatomical features of the lumbar spine. Understand how this framework provides flexibility and shock absorption in the lumbar region.
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