THORACIC CAVITY 



109 



3 4 



FIG. 54. Transverse section through 

 along the plane 



1. Sternum. 



2. Papillary muscle of right ventricle. 



3. Fifth costal cartilage. 



4. Pectoralis major. 



5. Skin. 



6. Right coronary artery. 



7. ( 'avity of right pleura. 



8. Musculi pectinati. 



9. Pericardium. 



10. Cavity of right atrium. 



11. Opening of hepatic vein. 



12. Valve of inferior vena cava. 



13. Inferior vena cava. 



14. Right phrenic nerve. 



15. Left atrium. 



16. Right bronchus. 



17. Lower right pulmonary vein. 



1 8. Oesophagus. 



19. Vena azygos. 



the Thorax of a young Male Adult 

 D-D, Fig. 15. 



20. Accessory hemiazygos vein. 



21. Cavity of left pleura. 



22. Eighth rib. 



23. Intervertebral cartilage between 



seventh and eighth thoracic 

 vertebras. 



24. Thoracic duct. 



25. Descending aorta. 



26. Left bronchus. 



27. Lower left pulmonary vein. 



28. Oblique sinus of pericardium. 



29. Coronary sinus. 



30. Left atrio-ventricular orifice. 



31. Left phrenic nerve. 



32. Inferior papillary muscle of left 



ventricle. 



33. Anterior margin of left pleura. 



34. Septal cusp of tricuspid valve. 



valve, consists of three semilunar cusps, but, in contra- 



