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Spine

Question

Where is the L4 Nerve root on this model ?

Name some features here..

Answer

The L4 nerve root exits the spinal canal below its numbered pedicle (here) It traverses the disc space above and here it is prone to compression by a posterolateral disc protrusion at L3/4.

Feature to be able to label

  • Vertebral body (with its superior and inferior endplate)
  • Spinal canal (conveying the neural elements)
  • Pedicles
  • Lamina
  • Transverse processes
  • Superior articuar facet
  • Spinous process
  • Inferior articular facet
  • Pars interarticularis (between the lamina and the pedicle) – site of a spondylolysis – pars defect
  • Intervertebral foramina

Answer