6 4 



THORAX 



on the posterior wall of the left atrium and ends in the upper 

 border of the sinus; and the small cardiac vein (O.T. right 

 coronary) runs along the lower margin of the heart with the 

 marginal branch of the right coronary artery, curves round 

 the right border of the heart, in the coronary sulcus, ends in 

 the right extremity of the coronary sinus. The anterior cardiac 



Superior vena cava 



Reflection of serous pericardium 



Right atrio- 

 ventricular opening 



Right auricle 

 Interatrial furrow 

 Left atrium 



Left auricle 



Crista terminalis 



Fossa ovali 



Valve of inferior 

 vena cava' 



Inferior vena cava 



\Left atrio- 

 ventricular opening 



Coronary sinus 



FIG. 31. The Anterior Aspect of the Atrial Part of the Heart. The 

 atria have been removed from the ventricles. The ventricular portion 

 of the same heart is depicted in Fig. 28. The specimen was hardened 

 in situ. 



veins are small vessels which ascend along the anterior surface 

 of the right ventricle and terminate directly in the lower and 

 anterior part of the right atrium. The venee cordis minima are 

 small veins which pass from the substance of the heart, and 

 more particularly from the walls of the right atrium and 

 ventricle, and open, by small orifices, into the cavity of the 

 right atrium. The orifice through which the great cardiac 

 vein opens into the coronary sinus is usually provided with a 

 valve ; the orifice of the small cardiac vein may be provided 



