. Human embryology and morphology. Embryology, Human; Morphology. -236 HUMAN EMBRYOLOGY AND MORPHOLOGY. Through the ventral part of the mesocardiurn the ducts of Cuvier reach the sinus from the somatopleure (Fig. 183). In fishes and in the human embryo the sinus pumps the blood into the primitive auricle, and its orifice into the auricle is protected by two valves, right and left (Fig. 197). vent, bend;. stomodaeum conus arteriosus ^r-aur. vent bend pericardium prim. aur. sinus venosus sept, trans . duct of Cuvier liver bud pleura. gut. vit. vein umb. vein Fig. ] 95. —Showing the two chief Ben
. Human embryology and morphology. Embryology, Human; Morphology. -236 HUMAN EMBRYOLOGY AND MORPHOLOGY. Through the ventral part of the mesocardiurn the ducts of Cuvier reach the sinus from the somatopleure (Fig. 183). In fishes and in the human embryo the sinus pumps the blood into the primitive auricle, and its orifice into the auricle is protected by two valves, right and left (Fig. 197). vent, bend;. stomodaeum conus arteriosus ^r-aur. vent bend pericardium prim. aur. sinus venosus sept, trans . duct of Cuvier liver bud pleura. gut. vit. vein umb. vein Fig. ] 95. —Showing the two chief Bends which occur in the Heart during the 3rd week. Fate of the Sinus Venosus (Fig. 196).—The sinus venosus shifts towards the right side of the primitive auricle and ulti- mately forms part of the right auricle and the coronary sinus. The part which it forms of the right auricle is indicated by the entrance of the following vessels which primarily terminate in the sinus: (1) The superior vena cava (the right duct of Cuvier); (2) The inferior vena cava, which also opens into the sinus; (3) The oblique vein of Marshall (left duct of Cuvier), which opens into the left horn of the sinus venosus. The left horn of the sinus becomes the coronary sinus. A groove, the sulcus terminalis, which is marked on the interior of the right auricle by a crest, runs down on the anterior wall of the right auricle from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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