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Fig. 1A. 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. Photograph of sagittal gross anatomic slice shows
interscalene triangle in 76-year-old male cadaver with arms positioned
alongside body. Interscalene triangle is bordered by anterior scalene muscle
anteriorly and by middle and posterior scalene muscles posteriorly.
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