AS = ansa subclavia, AScM = anterior scalene muscle, C1–C8 = 1st to 8th cervical nerves, ICSG = inferior cervical sympathetic ganglion, ITA = inferior thyroid artery, LC = lateral cord, LCM = longus capitis muscle, LT = lower trunk, MC = middle cord, MCSG = middle cervical sympathetic ganglion, MPScM = middle and posterior scalene muscles, MT = middle trunk, PC = posterior cord, PhN = phrenic nerve, SCA = subclavian artery, SCSG = superior cervical sympathetic ganglion, UT = upper trunk, VA = vertebral artery, XII = hypoglossal nerve