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Lumbar vertebrae

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The five lumbar vertebrae are characterised by:

  • body:
    • deeper, broader and stronger than in superior vertebrae
    • kidney-shaped from superior aspect
    • no articular costal facets on lateral margins
  • vertebral foramen:
    • triangular
    • larger than thoracic foramina, smaller than cervical foramina
  • transverse process:
    • base is termed the lateral tubercle
    • a small tubercle, the accessory process, projects posteriorly from lateral tubercle
    • with progression down spine, sequential transverse processes become displaced anteriorly from a junction with only pedicle to junction with only body
    • project posterolaterally
    • increase in length to L3 and then decrease again
  • superior articulating process:
    • project vertically up from the pedicle-lamina junction
    • plane of surface directed posteromedially
    • articulating surface concave
    • at posterolateral edge is rounded mamillary process
  • inferior articulating surface:
    • at junction of lamina and pedicle projecting vertically
    • articulating surface is convex
    • plane of articulating surface faces anterolaterally
    • with sequential vertebrae down spine, on individual vertebrae, the superior and inferior articulating surfaces get relatively closer together vertically, while inferior articulating processes get further apart horizontally
  • spinous process:
    • projects posteriorly
    • wider with successive inferior vertebrae
    • rectangular in median section
    • thickened posterior margin

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