THORACIC CAVITY 



most important viscera, vessels and nerves in the body, 

 i.e., the heart, enclosed in the pericardium ; the aorta and 

 its great branches ; the great vessels which carry the blood 

 to and from the heart ; the oesophagus and trachea ; the 



Trachea 



Vertebral artery 

 Inferior thyreoid artery 

 Transverse cervical artery 

 Trunk common to trans. 

 :ervical and trans, scap. arts. 

 Phrenic nerve - 



Right common carotid 



Right innominate vein _i 



Pericardiac vein 



Internal mammary 

 vessels 



Dut margins of right 

 pleura and of 

 pericardium -- 



Right lung 



mmon carotid 



Inferior thyreoid artery 

 t Phrenic nerve 



T" \ Trunk of trans, cervical 

 ( and trans, scap. arteries 



Scalenus anterior 



Left innominate vein 



Internal mammary 

 artery 



Left lung 



Cut margin of 

 left pleura 



Right coronary 



artery 



Cut margin of 



right pleura __ j 

 Cut margin of 

 pericardium - 



Ascending aorta 



Cut margin of 

 pericardium 



FIG. 27. Dissection of the Anterior Part of the Thorax. The sternum and 

 costal cartilages were replaced in position after the dissection had been 

 made. The right scalenus anterior is cut away from its insertion up to 

 the level of the upper border of the subclavian artery. 



vagi and phrenic nerves ; and the thoracic duct. It was 

 noted further that the mediastinum is separated, for descrip- 

 tive purposes, into two main parts, the superior and the 

 inferior mediastinum, by an imaginary plane which passes 

 from the lower border of the manubrium anteriorly to the 



lower border of the fourth thoracic vertebra posteriorly ; it has 



VOL. II 5 



