MUSCULAR ARCHITECTURE OF THE HUMAN HEART 221 



Vortex 



AP' 



Fig. 2 Apex of the heart to show the two vortices. A, superficial bulbo-spiral 

 bundle forming the posterior horn of the vortex, which then enters the septum; 

 B, superficial sino-spiral bundle forming the anterior horn of the vortex. This 

 bundle encircles the right ventricle, including its vortex, in its course to the an- 

 terior horn of the left vortex, SLA and SLB, anterior and posterior longitudinal 

 sulci. 



