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'''Paravertebral nerve blocks''' use local anaesthetic injected in the perineural region where the spinal nerves exit the vertebral canal. Commonly performed on the thriteenth, first and second lumbar nerves, as these innervate the flank, where this procedure is most useful. The most reliable technique use the cranial border of the transverse process of the vertebrae caudal to the nerve being blocked, inserting the needle 5-6cm off midline. However, this technique can be performed on cervival and thoracic regions also.  

'''Paravertebral nerve blocks''' use local anaesthetic injected in the perineural region where the spinal nerves exit the vertebral canal. Commonly performed on the thriteenth, first and second lumbar nerves, as these innervate the flank, where this procedure is most useful. The most reliable technique use the cranial border of the transverse process of the vertebrae caudal to the nerve being blocked, inserting the needle 5-6cm off midline. However, this technique can be performed on cervival and thoracic regions also.  

==Disadvantages==

==Disadvantages==

*Sometimes difficult to insert the needle in the correct position.

*Sometimes difficult to insert the needle in the correct position.