Archive image from page 330 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 REPTILIA. 309 shortly after its origin into three branches, of which one is the right or systemic aorta, the second the right subclavian, and the third the common trunk of the carotid and left subclavian arteries. The left or splanchanic aorta, previous to dividing among the vis- cera, gives off a large branch which communi- cates with the right descending or systemic aorta. The three great arteries, viz. the pulmonary, and right and left aorta, are closely
Archive image from page 330 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 REPTILIA. 309 shortly after its origin into three branches, of which one is the right or systemic aorta, the second the right subclavian, and the third the common trunk of the carotid and left subclavian arteries. The left or splanchanic aorta, previous to dividing among the vis- cera, gives off a large branch which communi- cates with the right descending or systemic aorta. The three great arteries, viz. the pulmonary, and right and left aorta, are closely connected together immediately after their origin, and dilate into expansions which are collectively larger than the cavities of the heart. In the common state of circulation the blood passes from the right ventricle chiefly into the pulmonary artery, and partly, also, into the branch arising from it, to enter into the left aorta. The blood of the left ventricle, on the other hand, is thrown into the right aorta, right subclavian, and carotid arteries, a small quantity only passing into the left aorta. When the animal is under water, the action of the lungs being inter- rupted, and the circulation of blood through them suspended, a larger proportion of the contents of the right ventricle must pass into the branch of communication with the left aorta, and it is probable that under such cir- cumstances only does it happen that the blood sent to the various organs is an admixture of arterial and venous blood, as in the Chelonia and other Sauria. In the serpent (Python Tigris, Dane?.) the blood of the general system is collected into a large elongated sinus, formed by the union of the inferior with the right superior cava. The left superior cava winds round the back of the left auricle, receives the coronary veins, and terminates in the lower part of the orifice which leads from the above sinus to the right auricle. This orifice is protected by two elongated semilnnar valves. Th
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