The atrioventricular node and the ventricular conducting system in the nonmammalian vertebrate heart.
D000663:Amphibians / Q000033:anatomy & histology; D000717:Anatomy, Comparative; D000818:Animals; D001717:Birds / Q000033:anatomy & histology; D005399:Fishes / Q000033:anatomy & histology; D006329:Heart Conduction System / Q000033:anatomy & histology*; D006352:Heart Ventricles / Q000033:anatomy & histology; D012104:Reptiles / Q000033:anatomy & histology