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FIG 4. Interscalene triangle (nerves roots).
A, Position of the probe to explore the nerve roots at the interscalene triangle.
B, Sonogram (90° left rotated) in a 26-year-old female volunteer shows the C5 (5), C6 (6), and C7 (7) nerve roots at the interscalene triangle.
C, Sagittal gross anatomic section at the interscalene triangle.
In B and/or C, 1 indicates anterior scalene muscle; 2, middle and posterior scalene muscles; 3, sternocleidomastoid muscle; 4, subclavian artery; 5–8, C5 through C8 nerve roots; 9, T1 nerve root; 10, first rib; S, skin.
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