Spinal anaesthesia,”Solution injected directly into CSF into the subarachnoid space at the 3rd, 4th
or 5th interspaceDrug comes into contact with spinal fluid and travel the length of spinal canalAll nerve roots in the path of the agent are anesthetizedDrag usually hyperbaric – heavier than spinal fluid – and level of anesthetic easily manipulated during first 5 minutes by adjusting the OR bed”