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Fig. 2B. —Costoclavicular space with arms positioned alongside body. 1 = clavicle, 2 = subclavian artery, 3 = subclavian vein, 4L = lateral nerve cord of brachial plexus, 4M = medial nerve cord of brachial plexus, 4P = posterior nerve cord of brachial plexus, 5 = first rib, 6 = subclavius muscle, 7 = pectoralis major muscle, 8 = pectoralis minor muscle, 9 = serratus anterior muscle, 10 = lung. Sagittal T1-weighted MR image of 31-year-old male volunteer shows costoclavicular space. Note costoclavicular space bordered anteriorly by inner half of clavicle and posteriorly by first rib.