The occurrence of the myocardial coat of pulmonary veins in various species of mammals.
D000818:Animals; D002335:Carnivora / Q000033:anatomy & histology*; D007312:Eulipotyphla / Q000033:anatomy & histology*; D009206:Myocardium / Q000166:cytology*; D011667:Pulmonary Veins / Q000166:cytology*; D012377:Rodentia / Q000033:anatomy & histology*