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. 2017 Jul 4;7(3):40. doi: 10.3390/diagnostics7030040

Figure 5.

Figure 5

The multiple piercing variant, identified using ultrasonography in the present study: (A) unlabeled; and (B) labeled. Note that the superior and middle trunks are not separated from the anterior scalene in this condition, visible as a lack of hyperechoic fascia. AS = anterior scalene; C5 = anterior ramus of C5; C6 = anterior ramus of C6; IT = inferior trunk; MS = middle scalene; MT=middle trunk; SCM = sternocleidomastoid; ST= superior trunk. The green outlines demarcate the trunks and roots of the brachial plexus.