THORACIC CAVITY 



end of the anterior longitudinal sulcus and terminate a 

 little to the left of the coronary sulcus. The second must 

 commence at the right end of the first and pass obliquely 

 downwards and to the right, along the left margin of the 

 coronary sulcus, to the lower border of the heart. The third 

 commences at the left end of the first, follows the line of the 

 anterior inter-ventricular sulcus, lying a little to its right side, 



Superior vena cava 



Innominate artery 

 Left subclavian artery 

 Left common carotid artery 



Aortic arch 

 Serous pericardium 



Ascending aorta 

 Pulmonary artery 



Right auricle (O.T. appendix) 



Left anterior pulmonary 

 sinus (Valsalva) 

 Pulmonary valve 



Conus arteriosus 



Anterior segment of 

 tricuspid valve 



Medial segment 



Anterior papillary 

 muscle 

 - Moderator band 



Inferior vena cava 



Inferior segment of tricuspid valve 



FIG. 36. The Interior of the Right Ventricle. 



and also terminates at the lower margin of the heart. After 

 the triangular flap thus formed is turned downwards and to 

 the right, the cavity of the ventricle should be cleaned with 

 the aid of sponge and forceps. If the moderator band of 

 muscle fibres, which connects the anterior wall of the ventricle 

 with the inter-ventricular septum, interferes with the necessary 

 displacement of the flap, it must be divided. 



The cavity of the right ventricle has a triangular outline. 

 The atrio-ventricular orifice opens into the lower and posterior 

 angle, the pulmonary artery springs from the upper and 



