. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE FOETAL CIRCULATORY SYSTEM 117. Fig. 66. Diagram of a ventral view of the course of the blood through the heart of a rabbit shortly before birth, ao, aorta; f, foramen ovale; i, opening of in- ferior vena cava; 1, opening of left superior vena cava; la, left atrium; Iv. left ventricle; pa, pulmonary- artery-; pv, openings of pulmonary veins; r, right superior vena cava; ra. right atrium; rv, right ventricle. The Linoxygenated blood from the rep^ions in front of the hear
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE FOETAL CIRCULATORY SYSTEM 117. Fig. 66. Diagram of a ventral view of the course of the blood through the heart of a rabbit shortly before birth, ao, aorta; f, foramen ovale; i, opening of in- ferior vena cava; 1, opening of left superior vena cava; la, left atrium; Iv. left ventricle; pa, pulmonary- artery-; pv, openings of pulmonary veins; r, right superior vena cava; ra. right atrium; rv, right ventricle. The Linoxygenated blood from the rep^ions in front of the heart enters the right atrium through the superior caval veins and, although there is no partition to separate it from the stream entering by the inferior caval, it is mainly directed through the right atrioventricular opening to the right ventricle and so into the pul- monary artery. The lungs being non-functional until birth, however, only a part of this current is carried to them, the greater portion passing through the wide ductus arteriosus (the retained dorsal part of the left sixth aortic arch) to the aorta. These vessels carrying unox^^genated blood appear black in the diagram. Some of the mixed blood which entered the aorta from the left ventricle has been distributed through the carotid arteries to the head and through the subclavian arteries to the anterior limbs before this final admixture of unoxygenated blood through the ductus arteriosus occurs, so that these anterior parts receive blood better ox\genated than that which reaches the trunk and tail. At its caudal end, the aorta divides into a pair of large common iliac arteries, the greater part of the blood from which enters the umbilical arteries and so is returned to the placenta to have its load of oxygen renewed. The external iliac artery, which continues into the hind limb, is con- siderably smaller in the foetus than the umbilical, and the hypogas- tric (internal iliac) is smaller still. Radical changes in thes
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