part of part of Homo sapiens lumbar vertebra 1 lumbar vertebral arch vertebral arch of first lumbar vertebra 2026-03-19T00:00:00Z A neural arch of the first lumbar vertebra, consisting of paired pedicles and laminae that together with the vertebral body enclose the vertebral foramen and protect the upper lumbar spinal cord and cauda equina. The arch bears short, stout transverse processes directed laterally and a broad, horizontally projecting spinous process; it lies immediately below the thoracolumbar junction. David Osumi-Sutherland