Specialized conducting fibers in the interatrial band.
D000818:Animals; D004285:Dogs; D006321:Heart / Q000033:anatomy & histology* / Q000502:physiology*; D006325:Heart Atria / Q000033:anatomy & histology; D006329:Heart Conduction System / Q000033:anatomy & histology* / Q000502:physiology*; D066298:In Vitro Techniques