A novel source of epicardium in birds: morphological observation
The main source of epicardium in birds is proepicardium, which is situated on the right horn of the sinus venous, dorsally to atrio-ventricular groove.Recently one more source of epicardium was described, it was named pericardial proliferates, that give rise to the epicardium of the distal part of the outflow tract.But, after proepicardium photoabl