Anatomy
Spondylolysis is a defect of the lumbar vertebra in the spinal column. The lumbar vertebra consist of a body, pedicle, lamina, pars interarticularis, transverse process, spinous process and superior articular facets, which form joints that link the vertebrae together. Spondylolysis specifically affects the pars interarticularis. When looking at the lumbar vertebra from the axial view, it is the bony mass between the facet joints, anterior to the lamina and posterior to the pedicle. When spondylolysis is present in the spine, it means that the pars interarticularis is detached and there is a separation of the joints.
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“I love to see, when leaves depart,
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—Ralph Waldo Emerson (1803–1882)
“Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.”
—Ralph Waldo Emerson (1803–1882)