In this research 28 specimens of Didelphis albiventris, 10 females and 18 males were used. After performing the injections with neoprene-látex stained with specif pigment, the animals were dissected. The right subclavian artery was originated from the braquiocephalic trunk in 11 cases (39.29%) and afterwards emerged the bicarotid trunk originating the right and left common carotid arteries. The braquiocephalic trunk divided into three branches, the right subclavian and the left and right common carotid arteries in 7 preparations (25%). The left common carotid artery was originated from the braquiocephalic trunk in 5 cases (17.86%), being followed by the right common carotid artery and the right subclavian artery. There was not a braquiocephalic trunk in 4 cases (14.28%), so it was first originated at the right subclavian artery and after the bicarotid trunk. The right subclavian artery and the right common carotid artery were originated from the braquiocephalic trunk in one case (3.57%), being the left common carotid artery originated directly from the aorta artery. The left subclavian artery originated directly from the aortic arch in all cases.
thoracic aorta; anatomy; irrigation
