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Roots/rami of the brachial plexus – sagittal oblique view. A: anterior. C: cranial. C4: C4 spinal root. C5: C5 spinal root. C6: C6 spinal root. C7: C7 spinal root. C8: C8 spinal root. D: distal. M: medial P: posterior. SA: subclavian artery. ScAM: scalenus anterioris muscle. The probe position is indicated by the white bar in the insert.
