Fig. 2

Ultrasound anatomy applied to cannulation of the peripheral veins of the upper limbs. Superficial veins (Sv) are found above fascia (delineated by arrows) in the cellular subcutaneous tissue (CST), and deep veins below fascia, or subfascial. As noted, deep veins are paired (brachial veins in this case), and are accompanied by an artery (A, brachial artery in this example) and a nerve (N, median nerve in this case) in the neurovascular bundle. The muscle (M) and the bone (B) are also found in the subfascial compartment. Superficial veins should be selected for cannulation