A manual of anatomy . emainder is overlapped bv the lungs and gives thedeep cardiac dulness. THE ARTERIES The circulations are the pulmonary and systemic; the systemic isdivided into general systemic and portal. The pulmonary circulation comprises the right ventricle, the pul-monary aorta and the pulmonary arteries, the lungs, pulmonaryveins and the left atrium. 224 THE BLOOD-VASCULAR SYSTEM The pulmonary aorta, or artery (arteria pulmonalis), leaves theright ventricle at the summit of the conus arteriosus. The vesselis about 2 inches (5 cm.) long and iM inches (30 mm.) in passes u
A manual of anatomy . emainder is overlapped bv the lungs and gives thedeep cardiac dulness. THE ARTERIES The circulations are the pulmonary and systemic; the systemic isdivided into general systemic and portal. The pulmonary circulation comprises the right ventricle, the pul-monary aorta and the pulmonary arteries, the lungs, pulmonaryveins and the left atrium. 224 THE BLOOD-VASCULAR SYSTEM The pulmonary aorta, or artery (arteria pulmonalis), leaves theright ventricle at the summit of the conus arteriosus. The vesselis about 2 inches (5 cm.) long and iM inches (30 mm.) in passes upward (cephalad) and dorsally and under the arch of theaorta it divides into right and left pulmonary arteries which furtherdivide and ramify the lungs. The base of the pulmonary aortahas three dilatations called the sinuses of Valsalva, two ventral andone dorsal. Here are seen the semilunar valves, three in number;each valve is semilunar in shape and is attached by its peripheral -RCw-Cnflre., Ui!^[^^ TeSu-bflft Lisflrt Fig, 175.—Arch of the aorta and its branches; the superior vena cava and its tributaries;the pulmonary arteries and veins. margin to the base of the pulmonary artery {annulus fibrosus). Theinner, or free edge, near its middle possesses a nodule called thecorpus arantii {nodulus valvulce semilunaris). From each side of thisa minute semilunar fold extends and is called lunule {lunula). Theright pulmonary artery is larger and longer than the left. Its firstbranch hes below the first branch bronchus. The first branch ofthe left pulmonary artery passes above the first branch bronchus. The pulmonary veins {vence pulmonales) are four in number. Thelobular divisions unite to form one vein for each lobe, three in theright lung and two in the left lung. The middle vessel on the rightside joins that of the upper lobe so that two veins leave each lungto empty into the left atrium. No valves are present. In the pulmonary circulation the venous or deoxygenated blood
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
