The conus arteriosus was divided into right and left halves and each half was subdivided into 3 portions: superior, middle and inferior. The study of the blood supply of the conus was performed in 8O human hearts. The results showed that the sternocostal wall of the conus arteriosus may be supplied by the arteria coni arteriosi but, more frequently by branches of the right and left coronary arteries. The most frequent branches supplying the conus arteriosus were the ramus anterior ventriculi dextri medialis and lateralis (85%), ramus coni arteriosi dexter (51.2%), ramus anterior ventriculi dextri medius I (47.5%), ramus anterior ventriculi dextri intermedius (41.2%), ramus coni arteriosi sinister (40%) and ramus anterior ventriculi dextri superior I (38.7%).