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The classic brachial plexus anatomy identified on ultrasound: (A) unlabeled; and (B) labeled. Note that the superior, middle, and inferior trunks are clearly separated from the anterior and middle scalene muscles by hyperechoic fascial planes. AS = anterior scalene; IT = inferior trunk; MS = middle scalene; MT = middle trunk; SCM = sternocleidomastoid; ST = superior trunk. The green outlines demarcate the trunks of the brachial plexus.
