Relation of Spinal Nerve Roots to Vertebrae Anatomy
C1 spinal nerve exits above C1 vertebra, Cervical enlargement, Occipital bone, C8 spinal nerve exits below, C7 vertebra (there are 8 cervical nerves but only 7 cervical vertebrae), Lumbar disc protrusion (dashed ovals) does not usually affect nerve exiting above disc. Lateral protrusion at disc level L4–5 affects L5 spinal nerve, not, L4 spinal nerve. Protrusion at disc level L5–S1 affects S1 spinal nerve, not L5 spinal nerve.
Lumbar enlargement, Conus medullaris (termination of spinal cord), Termination of spinal dura mater, Cauda equine Coccygeal nerve Coccyx, Coccygeal nerve, Filum terminale internum, Filum terminale externum.