DISSECTION OF THE THORAX 



419 



Clean the cavity. Observe the openings of the pulmonary veins 

 and the opening into the left ventricle. Examine the valve of the 

 oval foramen (valvula foraminis ovalis). 



FIG. 212. 



Aorta ascendens 



A. pulmonalis 



V. cava superior 



Vv. pulmonales 



Atrium sinistrum 

 V. cava inferior 



Ventriculus sinister 



Incisions to open the left atrium and ventricle by Cunningham's method. (After Cunningham, 

 Man. of Pract. Anat., Edinburgh, 1896, 2d ed., vol. ii. p. 58, Fig. 189.) 



Left Ventricle (Ventriculus sinister). 



Note its shape, size, and normal position. Observe that it 

 forms the apex cordis. 



Stand upon the right side of the cadaver, grasp the heart 

 with the left hand, the index-finger upon the upper part of the 

 sulcus longitudinalis posterior, the thumb upon the upper part 

 of the sulcus longitudinalis anterior. Plunge the long knife 

 through the ventricle from a point below the thumb one centi- 



