The Heart. 



369 



V. pulmonalis 

 sinistra 



Auricula sinistra 



v. pulmonalis dextra 



Basis cordis 1 



I V. cava superior 



Atrium sinistrum Y ' 



Sinus coronarius 



-V. cava inferior 



Atrium dextrum 



Septum ventriculorum 



Ostium venosum 



Ventrioulus, 

 sinister 



Ostium 



venosum 



^ dextrum 



VentriculH^ dexter 



Sulcus,k)ngitudinalis posterior 



Apex cordis 



414. Superficial muscle layer of a maximally 

 contracted heart, vieAved from below. 



(The fore - chambers or atria have been dissected off. Two windows have been cut into the 



superficial muscle layer in order to show the deeper bands of fibers. The outlines of the dilated 



ventricles of the heart are indicated in red, the position of the ostium arteriosum sinistrum 



being assumed to be fixed. [Text see pp. 370, 371 and 373.]) 



