The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . tile, and it is important that I should direct your attentionto their arrangement in the heart of the bird, and to the construc-tion of the. descending aorta, as this forms one of the connectinglinks between the circulation of birds and reptiles, on the onehand ; and birds and mammals on the other. The aorta of birds isvery short, and divides into three princi
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . tile, and it is important that I should direct your attentionto their arrangement in the heart of the bird, and to the construc-tion of the. descending aorta, as this forms one of the connectinglinks between the circulation of birds and reptiles, on the onehand ; and birds and mammals on the other. The aorta of birds isvery short, and divides into three principal branches almost beforeit leaves the left ventricle. (Fig. 81, a, b, c.) The aorta of birdsarches in the direction of the right bronchus; whereas, in mam-mals, it arches towards the left bronchus. (Compare b of , with u of Fig. 82.) Of the three branches of the aorta inbirds, one arches towards the right axilla, and the other to the left,these being analogous to the single arteria innominata of man, thebirds having virtually two innominates. The pulmonary arteryof birds divides into two branches as in the mammal, one going tothe right lung, the other to the left. (Fig. 81, el; compare with vof Fig. 82.) Fig. HI. Fig.
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