Anterior aspect jof mediastinum brachial plexus costal pleura right phrenic n superior vena cava right lobe of thymus left phrenic n middle lobe of right lung left lobe of thymus anterior boundary ot pleura pericardium mediastinal mediastinal pleura inferior border of lung inferior costodiaphragmatic recess undary of pleura costal archAnterior aspect jof mediastinum