TerminalnervesCordsDivisionsTrunksRoots(anterior rami)C5C6C7C8T1SuperiorMiddleInferiorLateralPosteriorPosteriorPosteriorPosteriorMedialAnteriorAnteriorAnterior Arrangedaround 2nd part of axillary arteryBSuperior cervical sympathetic ganglionInferior cervical sympathetic ganglionMiddle cervical sympathetic ganglionGray ramuscommunicansRoots (anterior rami of C5 to T1)Trunks (superior, middle, inferior)Divisions (anterior, posterior)Cords (medial, lateral, posterior)C8C7C6C5T1Middle scalene muscleAnterior scalene tendonA