84 OUTLINES OF ANATOMY. 



Auriculo-ventricular opening. Tricuspid valve, 970. (948-9) 



Cut away the upper portion of the conus arteriosus enough to expose the ventricular surface of 

 the semilunar valves, at the commencement of the pulmonary artery. Insert the blowpipe in the 

 end of the pulmonary artery, retaining it in place with a ligature. Innate the artery and demon- 

 strate the action of the valves. 



Open the pulmonary artery by a longitudinal incision and expose the pulmonary semilunar valves. 



Orifice of the pulmonary artery, 969. (937-8) 

 Pulmonary semilunar valves : 

 Sinuses of Valsalva. 

 Corpus Arantii. 

 Lunulse. 



Open the left auricle by an incision through the auricular wall, extending from the right to the 

 left pulmonary vein (upper), and a second incision from the middle of the first incision to the tip 

 of the appendix. 



Left auricle. Cavity, 970-1. (949-50) 

 Openings : Pulmonary veins. 



Auriculo-ventricular opening. 

 Foramina Thebesii. 



Pass the blowpipe through the aorta into the left ventricle, in the same manner as on the right side, 

 and demonstrate the action of the bicuspid valve and the closing of the auriculo-ventricular 

 opening. 



Open the left ventricle by an incision through the ventricular wall, about a half an inch to the left 

 of the interventricular grooves, beginning below the auriculo-ventricular groove and passing 

 downward to the apex of the ventricle and upward along the opposite margin of the cavity. 



Left ventricle, 971. (950) 



Columnar carneae. 



Musculi papillares. 



Chordae tendinese. 

 Auriculo-ventricular opening, 972. (950) 



Bicuspid valve. 



Os cordis. 

 Demonstrate the action of the aortic semilunar valves by inflating the aorta. 



Orifice of the aorta, 971-2. (950) 

 Semilunar valves. 



Open the aorta by a longitudinal incision and expose the aortic semilunar valves. Trace the 

 vessels of the heart, laying them open with the point of the knife. 



Coronary arteries, 502-3, 972-3. (494~5> 95 1 - 2 ) 

 Right coronary artery : 

 Right auricular branch. 

 Preventricular branch. 

 Right marginal branch. 

 Posterior interventricular branch. 

 Transverse branch. 

 Left coronary artery : 

 Left auricular branch. 

 Large anterior interventricular branch. 

 Left marginal branch. 

 Terminal branch. 



Variations in the Coronary Arteries. 



Cardiac or coronary veins, 646-7-8, 973-4-5. (633-4-5.952-3-5) 

 Coronary sinus: 



Great coronary or cardiac vein : 

 Anterior interventricular vein. 

 Left auricular vein. 

 Left marginal vein.' 



Posterior, middle cardiac, or posterior interventricular vein. 

 Right auricular, right coronary, or small coronary vein. 



