Regional anatomy in its relation to medicine and surgery . f the left left fourth rib.;The left fifth apex of the left ventricle of the heart (within the pericardium).The upper surface of the diaphragm on the left position of the aortic opening in the right subclavian artery. 20. The innominate artery. 21. The upper (cut) end of the oesophagus. 22. The right internal mammary artery. 23. The superior vena cava. 24. The right recurrent laryngeal nerve. 25. The trachea bifurcating into the right and left bron- chi. 26. The right second rib. 27. The right pn
Regional anatomy in its relation to medicine and surgery . f the left left fourth rib.;The left fifth apex of the left ventricle of the heart (within the pericardium).The upper surface of the diaphragm on the left position of the aortic opening in the right subclavian artery. 20. The innominate artery. 21. The upper (cut) end of the oesophagus. 22. The right internal mammary artery. 23. The superior vena cava. 24. The right recurrent laryngeal nerve. 25. The trachea bifurcating into the right and left bron- chi. 26. The right second rib. 27. The right pneumogastric nerve. 28. The root of the right lung. 29. The right third rib. 30. The left auricle of the heart. 31. The right fourth rib. 32. The thoracic aorta, with the roots of the intercostal arteries. 33. The inferior vena cava. 34. The right fifth rib. 35. The upper surface of the diaphragm on the right side. 36. The lower (cut) end of the cesophagus, where it passes through the diaphragm. 37. The spine of the tenth dorsal vertebra. P^^l?e40 Vol I. righl, 1831. b^eeomE Mc Clilllan, M. D. Dssected, Phoiu^rdphf^d and Loforec froir, Nature «> GeoRjfr Mr Clfllah. M D. Armslrong eCo Lith Boston I THE BEGION OF THE TSOEAX. 281 moderator, or a number of reticular fascicles taking its place, which pre-vents the complete reflection of the anterior wall. The most important of the columnse carneee are those which are calledthe musculi papillares. There are three of these, usually well formed, inthe right ventricle, corresponding in number to the flaps of the tricuspidvalve. They are attached by one end to the walls of the cavity, and atthe other terminate in the fine tendinous cords, the chordce tendinece,which regulate the action of the tricuspid valve. The two largest of thepapillary muscles arise from the anterior wall of the ventricle, and thesmallest from the septal wall. Occasionally accessory fasciculi are foundinterposed between the regular muscles and blending with them.
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