Contribuição ao estudo dos ramos arteriais hilares, justahilares e extrahilares em rins de cavalos(Equus caballus)

This study is based on the exam of 30 sets including kidneys, vassels, ureteres and tracts corresponding to the aorta artery and caudal cava vein: these sets were taken from adult horses, 12 male and 18 female, and the hilar, juxtahilar and extrahilar branches of the renal artery were studied, as well as the whole behaviour of these branches taken in isolation. The results allow the following conclusions: 1. From three to ten branches of the right renal artery enter the hilar region; and so do from three to eleven branches of the left renal artery. 2. From one to six branches of the right and left renal arteries occupy juxtahilar position. In 1 case on the right side, there were no juxtahilar vassels. 3. From one to fifteen branches of the right renal artery enter the extra hilar region, and so do from one to eighteen branches of the left renal artery. 4. In the hilar region the branches of the renal artery are mostly peripheric. 5. In the juxtahilar portion the branches of the renal artery are predominantly central. 6. In the extrahilar portion the branches of the renal artery are generally central. 7. The renal artery shows the same number of branches bilaterally in 6 cases. 8. There is positive correlation both to the left and to the right kidney among the number of hilar, juxtahilar and extrahilar branches independently of sex, statistically speaking.