<prompt> Pentothiol sodium should preferablay be injected intoFemoral veinAntecubital veinNeck veinVeins on outer aspect of fore arm  <response>: Inadverent intra-arterial injection occurs when thiopentone is injected in antecubital vein because in 10 of the cases brachial artery divides above elbow giving a very superficial abnormal artery which lies deep to antecubital vein. Therefore thiopentone injection should be given in the veins over the outer aspect of forearm not in antecubital vein. 