. The anatomy of the domestic animals. Veterinary anatomy. 622 BLOOD-VASCULAR SYSTEM OF THE HORSE on a curved crest, the crista terminalis, which indicates the junction of the primi- tive sinus reuniens of the embryo with the atrium proper, and corresponds with the sulcus terminahs externally.^ The openings of the venae cavse are valveless. A ridge, the intervenous crest (Crista intervenosa),- projects downward and forward from the dorsal wall just in front of the opening of the posterior vena cava; it tends to direct the flow of blood from the anterior vena cava to the atrio-ventricular. Aort
. The anatomy of the domestic animals. Veterinary anatomy. 622 BLOOD-VASCULAR SYSTEM OF THE HORSE on a curved crest, the crista terminalis, which indicates the junction of the primi- tive sinus reuniens of the embryo with the atrium proper, and corresponds with the sulcus terminahs externally.^ The openings of the venae cavse are valveless. A ridge, the intervenous crest (Crista intervenosa),- projects downward and forward from the dorsal wall just in front of the opening of the posterior vena cava; it tends to direct the flow of blood from the anterior vena cava to the atrio-ventricular. Aorta Left pulmonary artery pulmonary artery Pulmonary vein Posterior vena cava Fig. 546.—Left Side of Heart of Horse, Opened tp by Removal of Part of Wall. , Left atrium; Au. s., left auricle; V, V. 1', bicuspid valve; V. s., left ventricle; M, M, moderator band P, papillary muscles; /. ;3, great cardiac vein and circumflex branches of coronary arteries; 3. position of foramen ( of foetus; 4 openings of pulmonary veins (chiefly cut av aortic orifice. atrio-ventricxdar orifice; 6, arrow points toward opening. The fossa ovalis is a diverticulum in the septal wall, at the point of entrance of the vena cava, bounded laterally by a concave margin (Limbus fossee ovalis). The fossa is the remnant of an opening in the septmn, the foramen ovale, through which the two atria communicate in the fcetus. ' The crista terminalis is shown, but not marked, in Fig. 545; it is almost opposite (anterior) to the intervenous crest. The sulcus terminalis is commonly indistinct near the vens& caviE. ^ Also termed the tubercle of 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 Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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