Fourth Lumbar Vertebra (L4), Anterior View

Description

Centered in the lumbar spine, the fourth lumbar vertebra (L4) is presented from an anterior perspective, with the vertebral body dominating the view between the adjacent L3 and L5 bodies and their intervening intervertebral discs. Broad pedicles project posteriorly from the superolateral margins of the body, while the transverse processes extend laterally as sturdy levers for muscular attachment. Superior and inferior vertebral endplates frame the L4 body, the superior endplate slightly concave and the inferior endplate forming the interface to the L4 to L5 disc. Regional context is visible cranially through the thoracic and cervical segments and caudally into the sacrum and coccyx, reinforcing how lumbar size and contour differ along the vertebral column. Anterior emphasis on L4 matters because this level sits at the transition where load-bearing and mobility compete, and small changes in disc height or vertebral body shape alter foraminal and canal dimensions indirectly. Clinically, the L4 to L5 motion segment is a common site of degenerative disc disease and spondylolisthesis, and L4 nerve root symptoms often trace back to pathology at the adjacent L3 to L4 level, so accurate level identification prevents wrong-level surgery. Landmarks around L4 also guide procedures: the intercristal line between the iliac crests typically crosses the L4 spinous process level, a practical reference when planning lumbar puncture at L3 to L4 or L4 to L5. Use this asset for gross anatomy and musculoskeletal teaching to contrast lumbar vertebral body proportions against thoracic rib-bearing morphology, and for patient-facing education explaining why low-back pain clusters around the L4 to L5 disc. It also fits spine surgery, radiology, and pain-management materials that need a clean anterior bony reference for level localization and degenerative change discussions. Anatomical accuracy verified by SciePro's Medical Advisory Board.