Hyperbaric 0.5% Bupivacain Used in Subarachnoid Block Which Spread of Anesthesia to Cephalic at the Different Site of Injection Specially L 2-3, L 3-4, L 4-5 Inter Vertebral Space. TAJ: J of Teachers Assoc 2018, 28 (1), 1-5. https://doi.org/10.3329/taj.v28i1.39039.