The Motion Segment

The Motion Segment - The Motion Segment Some authors have...

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Unformatted text preview: The Motion Segment Some authors have defined a unit of the spine as two vertebrae and their soft tissue o this is called the motion segment Anterior Portion of the Motion Segment Anterior portion of the motion segment is comprised of: o two superimposed vertebral bodies o intervertebral disk (IV disk) o longitudinal ligaments Vertebral bodies o designed to bear compressive loads Intervertebral disks - two functions: 1. bear and distribute loads 2. restrain excessive motion o inner portion of disk is called the nucleus pulposis composed of a gelatinous mass withstands compressive loads o outer portion of disk is called the annulus fibrosis composed of fibrocartilage withstands high bending and torsional (twisting) loads o the disks become less flexible with age as they become dehydrated o the IV disks also become thinner as they become dehydrated Posterior Portion of Motion Segment...
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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The Motion Segment - The Motion Segment Some authors have...

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