In spinal anaesthesia the drug is deposited between-

Ans. is 'b' i.e., Pia and arachnoid matter Spinal anaesthesiao 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.o Site of spinal anaesthesiaL2.3 or L3-4 intervertebral space in adult (In adult spinal cord ends at lower border of L1 vertebrae).L4.5 intervertebral space in children (spinal cord ends at lower border of L3 vertebrae in children).o Spinal anaesthesia leads to creation of a zone of differential blockade, ie motor fibres are blocked two levels tower and autonomic fibres are blocked two levels higher than the sensory blockade due to different sensitivity of different fibres.