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Trunks of the brachial plexus formation – axial view. AT: anterior tubercle. C5: C5 spinal root. C6: C6 spinal root. CVB: cervical vertebral body. IJV: internal jugular vein. LCM: longus colli muscle. SAM: scalene anterioris muscle. SMM: scalenus medius muscle. SPM: scalenus posterioris muscle. SCM: sternocleidomastoid muscle. PT: posterior tubercle. VN: vagus nerve. The probe position is indicated by the white bar in the insert.
