The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

Fig. 1B. —Interscalene triangle. 1 = clavicle, 2 = subclavian artery, 3 = subclavian vein, 4u = upper trunk of brachial plexus, 4m = middle trunk of brachial plexus, 4l = lower trunk of brachial plexus, 5 = first rib, 6 = anterior scalene muscle, 7 = middle scalene muscle, 8 = dorsal scapular artery, 9 = lung. Sagittal T1-weighted MR images of 32-year-old male volunteer with arms positioned alongside body (B) and with arms hyperabducted (C) show interscalene triangle. In C, note narrowing of space between posterior side of clavicle and anterior side of anterior scalene muscle (prescalene space) when compared with B.