. The anatomy of the domestic animals . Veterinary anatomy. 630 BLOOD-VASCULAR SYSTEM OF THE HORSE aortse. Here is forms three pouch-like dilatations, the sinuses of the aorta. These correspond to the cusps of the aortic valve, and the coronary arteries arise from the left posterior and anterior sinuses. At the arch the diameter is about two inches (ca. 5 cm.), and beyond this it diminishes rather rapidly in width. It is convenient to divide the aorta into thoracic and abdominal parts. The thoracic aorta (Aorta thoracica) (Figs. 553, 554) lies within the pericardium to the point of attachment
. The anatomy of the domestic animals . Veterinary anatomy. 630 BLOOD-VASCULAR SYSTEM OF THE HORSE aortse. Here is forms three pouch-like dilatations, the sinuses of the aorta. These correspond to the cusps of the aortic valve, and the coronary arteries arise from the left posterior and anterior sinuses. At the arch the diameter is about two inches (ca. 5 cm.), and beyond this it diminishes rather rapidly in width. It is convenient to divide the aorta into thoracic and abdominal parts. The thoracic aorta (Aorta thoracica) (Figs. 553, 554) lies within the pericardium to the point of attachment of the ligamentum arteriosum, and is enclosed with the pulmon- ary artery in a prolongation of the epicardium. Beyond this it is between the two pleural sacs. It is crossed on the right by the oesophagus and trachea, on the left by the left vagus nerve. The left recurrent nerve winds around the concavity of the Right branch of pulmonary Pulmonary veuis artery Vena azygos Great coronary vein- Small coronary vein. Rigid coronary artery Veins are black, arteries white. Fig. 551.—Cardiac Vessels of Horse; Right Side. The circumflex branch of the coronary artery is largely concealed by the great coronary vein. arch from the lateral to the medial side, and the vena azygos and thoracic duct lie along the dorsal part of its right face. The trachea causes it to deviate to the left, but beyond this it becomes median. The abdominal aorta (Aorta abdominalis) (Fig. 575) is related dorsally to the lumbar vertebrae, the ventral longitudinal ligament, and the left psoas minor muscle; in the hiatus aorticus it is related to the cisterna chyli. On its right is the posterior vena cava, and on its left the left kidney and ureter. BRANCHES OF THE THORACIC AORTA I. CORONARY ARTERIES The two coronary arteries, right and left, are distributed almost entirely to the heart, but send some small twigs to the origins of the great vessels. The right coronary artery (A. coronaria dextra) arises from the an
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