Figure 1: (a) Image of dorsolateral surface of hand showing sensory innervation of superficial radial nerve; (b) The dorsolateral surface of hand showing cephalic vein (yellow arrow) and site of cannulation (yellow arrow); (c) The position of the linear ultrasound probe in middle third of the forearm; (d)Sonoanatomy at middle third of forearm showing superficial radial nerve (blue arrow) and radial artery (red arrow)