Fig. 10 Same view as fig. 5 with 

 the superficial bulbo-spiral band 

 thrown back and the deep bulbo- 

 spiral band removed entirely. The 

 origin of these two bundles is 

 shown, BS, and BS', at the base 

 of the heart; C, a strand of the 

 bulbo-spiral band not turned 

 back; LRV, longitudinal bundle 

 of the right ventricle. The course 

 of the bulbo-spiral band is marked, 

 BS; it ends at X. 



