. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE CIRCULATORY APPARATUS OF BIRDS. 647 detached separately from the cistern, one follows the right side, the other the left side of the aorta, describing an arch whose concavity is downward at the base of the lieart, on the lateral parts of the trachea, terminating either very near one another, and on the same transversal line, at the junction of the two jugulars, or one to the right, the other to the left, in each of these two veins, and not far from their junction with the axillaries (Fig. 307.) " When the two c
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE CIRCULATORY APPARATUS OF BIRDS. 647 detached separately from the cistern, one follows the right side, the other the left side of the aorta, describing an arch whose concavity is downward at the base of the lieart, on the lateral parts of the trachea, terminating either very near one another, and on the same transversal line, at the junction of the two jugulars, or one to the right, the other to the left, in each of these two veins, and not far from their junction with the axillaries (Fig. 307.) " When the two canals arise from the sublumbar reservoir, tliey sometimes repeatedly anastomose with each other by sinuous and curved branches, as shown in figure 308. Fi?. 309. THORACIC DUCT OF SMALL RF3IINANTS, " Then all the branches collect in the anterior mediastinum, and constitute a single canal which, near its termination, again subdivides into four vessels that open separately, two to the right and two to the left, in the usual place. " This variety is tlie most remarkable and complicated of all those observed in the domesticated animals. Pig.—" The thoracic duct of the Pig, usually single throughout its whole extent, is sometimes divided, at one to one and a-half inches from its insertion, into two branches which soon reunite in an oval dilatation ; this, after receiving the vessels from the head, neck, and limbs, opens towards tlie extremity of the left jugular. Carnivora.—" In the Dog, Pecquet's reservoir is enormous; in shape it is ovoid, and is prolonged between the pdlars of the diaphragm into the thoracic cavity. The thoracic duct of this animal generally resembles that of the Pig. Yet it sometimes oflers in its course and termination very numerous variations: Rudbecky has noticed a bifurcation above the heart, and another bifurcation wliose branches anastomose with each other several times. Swammerdam and Stenon have figured numerous irregular anastomot
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