Anatomy of Lumbar Vertebrae Features

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What is the main function of the sacral hiatus?

To allow the spinal nerves to exit

Which lumbar vertebrae have a coronal orientation of facet joints?

L5-S1

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

Wedge-shaped

What is the main function of the posterior sacroiliac ligament?

To support the sacroiliac joint

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

To give flexibility during flexion and extension

What causes instability in pelvic fractures according to the text?

Disruption of the posterior sacroiliac ligament

Explore the key features of lumbar vertebrae including the size and orientation of the body, pedicles, laminae, spinous processes, transverse processes, and facets. Learn about the unique characteristics of the L5 vertebra.

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