n6 THE CIRCULATION. 



and borders are fastened by slender tendinous fibres, the 

 chorda tendinece, to the walls of the ventricles, the muscular 

 fibres of which project into the ventricular cavity in the 



Fig. 35-* 



* Fig. 35. The left auricle and ventricle opened and a part of their 

 anterior and left walls removed so as to show their interior. \. The 

 pulmonary artery has been divided at its commencement so as to show 

 the aorta : the opening into the left ventricle has been carried a short 

 distance into the aorta between two of the segments of the semilunar 

 valves ; the left part of the auricle with its appendix has been removed. 



