Each lumbar vertebra consists of a weight bearing body anteriorly, and a posterior arch consisting of pedicles, lamina, spine, superior and inferior articular processes and facets, and transverse processes. The connections of articular processes maintain the antero-posterior alignment of the spine. The spinal foramen is enclosed by the body and the arch, and the spinal canal is constituted by the spinal foramina of all the vertebrae. Impingement on the spinal canal by acquired or congenital bony deformity can cause neurologic symptoms.
Link to this frame from your Personal Thumbnails page?