MUSCULAR ARCHITECTURE OF THE HUMAN HEART 259 



Fig. 18 Outer half of specimen shown in fig. 17 cut off and superposed upon the 

 inner half to show proper relation of the papillary muscles. Letters as in fig. 17. 



bundles are constantly passing into the depth whence they pass 

 upward towards the conus. Especially is this true along the 

 anterior longitudinal sulcus, as shown in fig. 6. This observa- 

 tion was first made by Wolff and has been repeatedly confirmed. ^^ 

 It is not difficult to see in this arrangement an extension upward 

 of the vortex of the right ventricle. When these bundles once 

 reach the inside of the right ventricle they all have an upward 

 tendency, towards the conus. On the septal side the inner fibers 

 pass towards the membranous septum, that is towards the ostium. 

 These fibers communicate freely with the papillary muscles of 



«* Parchappe, Du Couer, Rouen, 1846, PI. 5, fig. 1. 



