9/20 - Lumbar Spine Anatomy

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Last updated 7:43 PM on 9/20/26
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31 Terms

1
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How many lumbar vertebrae are present?
Five, designated L1 through L5.
2
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What type of normal curvature is found in the lumbar spine?
Lordotic curvature.
3
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What does lordosis describe?
An anterior convex curvature of the vertebral column.
4
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Which vertebrae are the largest and strongest in the movable vertebral column?
The lumbar vertebrae.
5
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Why do lumbar vertebral bodies increase in size from L1 to L5?
They support progressively greater body weight as the vertebral column descends.
6
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What is the primary weight-bearing portion of a lumbar vertebra?
The vertebral body.
7
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What structures form the vertebral arch?
The pedicles and laminae.
8
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What is the function of the pedicles?
They connect the vertebral body to the posterior elements and form the lateral portions of the vertebral arch.
9
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What is the function of the laminae?
They form the posterior portion of the vertebral arch between the transverse processes and spinous process.
10
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What passes through the vertebral foramen?
The contents of the vertebral canal, including the spinal cord superiorly and cauda equina in the lumbar region.
11
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What passes through an intervertebral foramen?
A spinal nerve and associated vessels.
12
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How are the lumbar intervertebral foramina oriented?
Approximately 90° to the midsagittal plane.
13
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Which projection best demonstrates the lumbar intervertebral foramina?
The lateral projection.
14
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What forms a zygapophyseal joint?
The inferior articular process of one vertebra articulating with the superior articular process of the adjacent vertebra.
15
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Which projection best demonstrates lumbar zygapophyseal joints?
Oblique projections.
16
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Approximately what body rotation demonstrates the L1-L4 zygapophyseal joints?
Approximately 45° oblique.
17
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Approximately what body rotation best demonstrates the L5-S1 zygapophyseal joints?
Approximately 30° oblique.
18
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What is the pars interarticularis?
The portion of bone located between the superior and inferior articular processes.
19
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Which lumbar projection demonstrates the pars interarticularis as part of the Scotty dog?
The oblique projection.
20
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What structure forms the eye of the Scotty dog?
The pedicle.
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What structure forms the nose of the Scotty dog?
The transverse process.
22
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What structure forms the ear of the Scotty dog?
The superior articular process.
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What structure forms the front leg of the Scotty dog?
The inferior articular process.
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What structure forms the neck of the Scotty dog?
The pars interarticularis.
25
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What is spondylolysis?
A defect or fracture of the pars interarticularis.
26
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How may spondylolysis appear on an oblique lumbar radiograph?
As a defect through the neck of the Scotty dog.
27
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What is the lumbosacral junction?
The articulation between L5 and S1.
28
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Which lumbar vertebra articulates with the sacrum?
L5.
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Which lumbar vertebra supports the greatest amount of body weight?
L5.
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What is an intervertebral disk?
A fibrocartilaginous structure between adjacent vertebral bodies that absorbs shock and permits movement.
31
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What is the difference between the vertebral foramen and an intervertebral foramen?
The vertebral foramen forms the spinal canal, while the intervertebral foramen is the opening through which a spinal nerve exits.