From a posterior approach, the brachial plexus is anterior to the following muscle planes from superficial to deep: trapezius, rhomboids and levator scapulae, serratus posterior superior, scalenus posterior, and scalenus medius respectively. In this exposure, the subclavian artery is anterior to (deep to) the lower trunk.
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Hager S, Backus TC, Futterman B, Solounias N, Mihlbachler MC (2014) Posterior subscapular dissection: an improved approach to the brachial plexus for human anatomy students. Ann Anat 196(2–3):88–91CrossRefPubMedGoogle Scholar