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Schematic drawing showing anatomic principles of selective scalenectomy for periforaminal exposure. (a) Coronal view. (b) Axial view. AN - Accessory nerve, ASM - Anterior scalene muscle, CA - Carotid artery, CL - Clavicle, IT - Inferior trunk, JV - Jugular vein, LC - Longus colli, MSM - Median scalene muscle, MT - Medial trunk, NR - Nerve root, PN - Phrenic nerve, PSM - Posterior scalene muscle, SCM - Sternocleidomastoid muscle, ST - Superior trunk, VN - Vagal nerve
