<unk>  (or Purkyne tissue) are located in the inner ventricular walls of the heart, just beneath the endocardium.  These<unk>  are specialized myocardial<unk>  that conduct an electrical stimulus or impulse that enables the heart to contract in a coordinated fashion.
Purkinje fibers
Bundle of Kent
James fibers
Papillary muscle
Ventricle 
Interventricular septum
Atrioventricular node
Sinoatrial node