la cava o Body of sternum Internal thoracic artery o ● Ascending aorta Right superior pulmonary vein e Left atrium phrenic nerve Transverse pencardial sinus Pectoralis major o 3rd rib Middle lobar bronchus Left phrenic nerve Right lung, middle lobe Left auricle Left lung, superior lobe Middle lobar bronchus Mammary gland Inferor lobar bronchus Long thoracic nerve Bronchopulmonary Inferior lobar arteries o- Oblique fissure Pleural cavity or lobe Posterior basal Serratus anterior一 Latissimus dorsi垂 ● Left interior pulmonary vein Right interior pulmonary vein e Contents FE: It contains the rudiment of the lower part of the thymus, the internal thoracic vessels and their branches, a part of the anterior mediastinal lymph nodes and some loose connective tissue.内有胸腺下部、胸廓内血 管及其分支、纵隔前淋巴结和疏松结缔组织。• Contents 内容：It contains the rudiment of the lower part of the thymus, the internal thoracic vessels and their branches, a part of the anterior mediastinal lymph nodes and some loose connective tissue.内有胸腺下部、胸廓内血 管及其分支、纵隔前淋巴结和疏松结缔组织