9 6 



THORAX 



the upper extremities, the walls of the thorax, and the upper 

 parts of the walls of the abdomen. It commences, by the 

 union of the right and left innominate veins, at the level of 

 the lower border of the sternal end of the first right costal 

 cartilage (Figs. 27, 32); and it terminates, in the upper and 

 posterior part of the right atrium, at the level of the third 



Sternum Internal mammary vessels 



Skir 



Anterior papillary 

 muscle 



Conus arteriosus 

 cavity 



Post cusp of valve 

 of pulmonary artery 

 Left coronary artery 



Left phrenic nerve 

 Auricle of left atrium 



Left pulmonary 

 artery 



Left bronchus 



Lymph gland 



Left vagus nerve 



Descending aorta 



Accessory 

 hemiazygos vein 



Pectoralis major 

 Fourth costal 

 cartilage 



Auricle of right 

 atrium 



Pericardia! cavity 

 Right coronary art 



Ascending acrta 

 Superior vena cav; 



Right phrenic ner 



Right pulmonary 

 artery 



--^ Right bronchus 



Right vagus nerve 

 Lymph glands 

 OEsophagus 

 Vena azygos 



Thoracic duct 

 Intervertebral carl 

 age between 5th ai 

 6th thoracic vertel 

 Sixth rib 



- Fifth rib 



FIG. 48. Transverse section through the Thorax of a young Male Adult 

 along the plane C-C, Fig. 46. 



right costal cartilage, at the right border of the sternum. 1 It 

 lies partly in the superior and partly in the middle medias- 

 tinum, and its lower half is within the fibrous pericardium 

 and is partly ensheathed by the serous pericardium (Fig. 32). 

 Tributaries. The tributaries of the superior vena cava are 

 the two innominate veins, by whose junction it is formed, 



1 In the specimen shown in Fig. 15 it terminated at the level of the 

 fourth right costa cartilage. 



