Kinesiology 3550A/B Lecture Notes - Lecture 5: Sciatica, Posterior Longitudinal Ligament, Anatomical Terms Of Motion
2 Nov 2017
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Document Summary
Heavy work managing low-back injuries in the workplace. Jelly-like interior (nucleus pulposus) is soft and resists compression: discs have a strong fibrous outer exterior (annulus fibrosus) that surrounds the interior, discs have very little nerve supply and contain no blood. Discs receive nutrients through diffusion: serve as a shock absorbing system firmly connected to adjacent vertebrae, protect the vertebrae from bone to bone contact. Discs are largest in the morning after sleeping: exhibit viscoelastic properties, forces of rapid onset are resisted in an elastic manner, under continuous loading it will exhibit viscous deformation known as creep. Anatomy: facet joints narrowing over time: located behind the discs, each vertebra contains two small joints called facet joints articulating with adjacent vertebrae. Interacting surface is smooth cartilage: each joint is surrounded by a synovial capsule containing a nourishing and lubricating fluid, help to stabilize the vertebrae during movement.
