Trapezius muscleMiddle scalene muscleTransverse cervical arteryBrachial plexusSuprascapular artery3rd part of subclavian arteryPhrenic nerveAnterior scalene muscleSubclavian veinExternal jugular veinInternal jugular veinClavicle1st part of subclavian arteryVagus nerveCommon carotid arteryThyrocervical trunkInferior thyroid arterySternocleidomastoid muscle