Abstract
A malformation of the heart and great vessels, in which the aorta and the pulmonary trunk originated from the right ventricle, has been reported in a 1 1/2 year-old horse. It is suggested that the oxygenated blood from the left ventricle was ejected through a large septal defect into the right ventricle where partial mixture of the blood took place. The function of the right ventricle was to pump the blood into the aorta and the pulmonary trunk. The muscular ridge, which was interposed between the aorta and the pulmonary trunk, might have directed a portion of the predominately oxygenated blood into the aorta and a portion of the predominately venous blood into the pulmonary trunk.
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