The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 182.—Heart and Great Vessels of Buteo Vulgaris. —Gegenbaur. tr, Trachea; trcrop ; ae, communication between the air-sacs and the lungs ; b, Bursa Fabricii ; aoraortic arch ; aad, right anonymous artery ; acts, left anonymous artery ; ps, leftpulmonary artery ; c, carotid ; am, visceral artery ; vci, commencement of theinferior vena cava ; vcm, artery to coccygeal and mesenteric regions. In Fig. 184, we have the different stages in development ofthe proximal arterial vessels in embryological evolntion,
The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 182.—Heart and Great Vessels of Buteo Vulgaris. —Gegenbaur. tr, Trachea; trcrop ; ae, communication between the air-sacs and the lungs ; b, Bursa Fabricii ; aoraortic arch ; aad, right anonymous artery ; acts, left anonymous artery ; ps, leftpulmonary artery ; c, carotid ; am, visceral artery ; vci, commencement of theinferior vena cava ; vcm, artery to coccygeal and mesenteric regions. In Fig. 184, we have the different stages in development ofthe proximal arterial vessels in embryological evolntion, to be 430 EVOLUTION OF AKTEEIAL VESSELS. read from left to right, beginning by the formation of thetruncus arteriosus with one vascular loop only, the ones imme-diately succeeding this being shaded in, then the upper ones ;making five pairs of vascular loops in all, as in the fishes (2); fol- t I 31 iv. Eijr. 183.—Showing Mode of Termination of the Great Venous Trunks in DifferentStages in Development, viewed from behind.—Gegenbaur. I, Reptile (Python) ; II,Bird (Larcorhamphus) ; III, Marsupial (Halmaturus) ; IV, Pig ; i, Vena cava inferior;s, vena cava superior sinistra ; d, vena cava superior dextra ; ap, pulmonary artery;si; sinus venosus.
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
