<prompt> In spinal anaesthesia the drug is deposited between?Dura and arachnoidPia and arachnoidDura and veebraInto the cord substance  <response>: Ans. is b i.e., Pia and arachnoid matter o In spinal anaesthesia LA is injected into subarachnoid space space between pia matter and arachnoid matter. o Structure pierced during SA from outside in - Skin - Subcutaneous tissue -- Supraspinous intraspinous ligament -- Ligamentum falvum -- Duramater - Arachnoidmater. 