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13 Cards in this Set
- Front
- Back
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Intervertebral discs are present in the cervical spine except?
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Between the occiput and C1 and between C1 and C2
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What shape are the discs in both the cervical and lumbar portions?
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Elliptical
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Why is an ellipitical shaped disc a bad thing?
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Because it can lead to posterior and posterolateral stress concentrations because of torsion or twisting
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What is the advantage of having an elliptical shaped disc?
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Such an arangement places a larger proportion of the reinforcing annular fibers posterior to the axis of forward bending; thus complete failure of the posterior annulus is potentially avoided
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The cervical discs to do do what to the lateral rims of the vertebral bodies?
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They are different from thoracic and lumbar in that the discs do not extend to the lateral rims of the vertebral bodies
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The direction of the annulus is what?
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The direction of the fibers alternate by about 90 degrees with each successive layer.
The fiber orientation is usually between 30 and 40 degrees to the horizontal |
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What is the primary checkrein for any horizontal translation between adjacent vertebrae?
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The annulus fibrosis
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What is the nucleus pulposis comprised of?
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hydrated gel of proteoglycans with some collagen. Water accounts for 80%
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How much of the nucleus pulposis is collegen?
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5%
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What is one reason why there is so much motion in the cervical spine?
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The height of the cervical disc in relation to its surface area
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What is the primary reason for the cervical Lordosis?
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The cervical discs are wedge shaped being higher anteriorly than posterioly
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Pain in Disc degeneration might result because of what?
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Because they have found that there might be free nerve endings such as Pacinian corpuscles within the annulus fibrosis that detects mechanical pressure
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What can happen with disc degeneration?
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herniated nucleus pulposis,
fissuring cracking of the annulus fibrosis diffuse bulging or local extrusion of the disc material |
