. A laboratory manual and text-book of embryology. Embryology. /?. atrium Cayifyof Bulbus y. ft. ventricle y^^^^^^&^^a^^^^^ Fig. 128.—Transverse section through the fifth pair of aortic arches and bulbus cordis of a 10 mm. pig embryo. X the upper limb buds. Dorsal to the atria are the common cardinal veins, the right vein forming part of the sinus venosus. The sinus venosus drains into the right atrium through a slit-like opening in the dorsal and caudal atrial wall. The opening is guarded by the right and left valves of the sinus venosus, which project into the atrium. The septum pr
. A laboratory manual and text-book of embryology. Embryology. /?. atrium Cayifyof Bulbus y. ft. ventricle y^^^^^^&^^a^^^^^ Fig. 128.—Transverse section through the fifth pair of aortic arches and bulbus cordis of a 10 mm. pig embryo. X the upper limb buds. Dorsal to the atria are the common cardinal veins, the right vein forming part of the sinus venosus. The sinus venosus drains into the right atrium through a slit-like opening in the dorsal and caudal atrial wall. The opening is guarded by the right and left valves of the sinus venosus, which project into the atrium. The septum primum completely divides the right and left atria at this level, which is caudal to the foramen ovale and the atria-ventricular openings. The septum joins the fused endocardial cushions. Note that the esophagus and trachea are now tubular and that the left descending aorta is much larger than the right. Around the epithelium of both trachea and esophagus are condensations of mesenchyma, from which their outer layers are differentiated. Section through the Foramen Ovale of the Heart (Fig. 130).—The level of this section is cranial to that of the previous figure and shows the septum primum interrupted dor- sally to form the foramen ovale. Each atrium communicates with the ventricle of the same. 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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