Colaterais do arco aórtico da capivara (Hydrochoerus Hydrochaeris) Collaterals of the aortic arch in capybara (Hydrochoerus Hydrochaeris)

Capybara is a rodent mammal, from South America, herbivorous, semiaquatic, of Hydrochoeridae family. In this research 7 specimens of capybara (Hydrochoerus hydrochaeris ), were used, all of them were females. After performing the injections with neoprene-latex stained with specif pigment, the animals were dissected. Only the brachiocephalic trunk originating from de aortic arch in all cases. The brachiocephalic trunk was first originate the left subclavian artery after the left commo n carotid artery and afterwards emerged the brachiocarotid trunk originating the right common carotid artery and the right subclavian artery in 4 cases (57,1%). In 2 cases (28,6%) the brachiocephalic trunk originating the left subclavian artery and after divide d into three branches, the right subclavian artery, the left and right common carotid arteries. In one case (14,3%) were first or iginated from the brachiocephalic trunk the left and the right subclavian artery and after the bicarotid trunk that originated the left and right carotid arteries. The aortic arch in capybara emited, as the only one collateral branch, the brachiocephalic trunk.