<P> Before reaching the hilus of the kidney, each artery divides into four or five branches; the greater number of these (anterior branches) lie between the renal vein and ureter, the vein being in front, the ureter behind, but one or more branches (posterior branches) are usually situated behind the ureter . </P> <P> Each vessel gives off some small inferior suprarenal branches to the suprarenal gland, the ureter, and the surrounding cellular tissue and muscles . </P> <P> One or two accessory renal arteries are frequently found, especially on the left side since they usually arise from the aorta, and may come off above (more common) or below the main artery . Instead of entering the kidney at the hilus, they usually pierce the upper or lower part of the organ . </P> <P> The arterial supply of the kidneys is variable and there may be one or more renal arteries supplying each kidney . It is located above the renal vein . Supernumerary renal arteries (two or more arteries to a single kidney) are the most common renovascular anomaly, occurrence ranging from 25% to 40% of kidneys . </P>

Where does the renal artery enter the kidney
find me the text answering this question