ABSTRACT
This chapter explains that the nervous system extends from foramen magnum to the sacral hiatus. The epidural and paravertebral space is the potential space surrounding the dural sac within the vertebral canal. The dural sac Comprises dura and arachnoid membranes, subarachnoid space, spinal nerves (cauda equine and filum terminale). For a lumbar paravertebral block, an 8 cm needle inserted perpendicular to the skin 3–5 cm lateral to L4 spinous processes to hit the transverse process. The chapter illustrates the relationships of epidural space, structures passed through to reach the epidural space, cutaneous nerves of upper limb, cutaneous nerves of lower limb, and brachial plexus.
