Archive image from page 1067 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Wall of right atrium Septum primum fusing with inferior atrio- ventricular cushion Septum primum Left venous valve Right - venous valve Inferior atrio- ventricular cushion Bight posterior cardinal veins opened Right duct of Cuvier opening into right horn of sinus venosus 7th intersegmental artery Dorsal aorta Vertebral artery Basilar artery Posterior cerebral artery Middle cerebral artery Anterior cerebral artery Pig. 832.—Development of the Heart


Archive image from page 1067 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Wall of right atrium Septum primum fusing with inferior atrio- ventricular cushion Septum primum Left venous valve Right - venous valve Inferior atrio- ventricular cushion Bight posterior cardinal veins opened Right duct of Cuvier opening into right horn of sinus venosus 7th intersegmental artery Dorsal aorta Vertebral artery Basilar artery Posterior cerebral artery Middle cerebral artery Anterior cerebral artery Pig. 832.—Development of the Heart and the Main Arteries. Diagram of the heart, showing the formation of its septa, and of the cephalic portion of the arterial system septum primum, fuses with the angle between the right horn and the intermediate part of the sinus venosus forming with it the lower part of the limbus fosste ovalis of the fully developed heart. The remainder of the limbus is formed by the thickened free margin of the septum secundum. As soon as the septum secundum passes beyond the level of the foramen ovale that portion


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