Polar Arteries Vs Accessory Artery
aorta) is present in 21 % of cases whereas early branching of the right renal arteries is present in 15 % of individuals.(38)
MIP image showing right renal prehilar bifurcation(arrow) and left renal artery duplication(arrowhead).
III) ACCORDING TO ORIGIN
In case of multiple arteries supplying the single kidney, the artery having largest diameter is considered as the main artery and the rest of the arteries are known as the accessory arteries. These arteries can be divided into two categories according to how they the kidney: hiliar, entering at the hilium, and polar, reaching at the pole. (39). The most frequent accessory artery is a polar artery arising from the aorta, close to the origin of the main renal branch, and supplies the inferior renal pole. The second most frequent supplementary artery irrigates the upper pole, which is normally a small segment [40]. Some authors call polar arteries those that attain any of the kidney poles with independence of its origin. It may be helpful, strictly from a labelling point of view, to distinguish between these polar arteries, tagging them as polar branches when they arise from the main renal artery and polar accessory arteries when they have a separate origin. The importance of polar arteries is shown in the fact that they supply renal …show more content…
It has been demonstrated that, as opposed to the intrarenal arteries, the intrarenal veins show no segmental arrangement at all, there being a free anastomosis of the venous system throughout the kidney. These anastomoses occur at different levels between the stellate veins (cortex), between the arquate veins (base of the pyramids) and between the interlobar veins (close to the renal sinus). There are also anastomoses around the calyceal necks that join a longitudinal system that ends up forming big trunks that finally form the main renal
MIP image showing right renal prehilar bifurcation(arrow) and left renal artery duplication(arrowhead).
III) ACCORDING TO ORIGIN
In case of multiple arteries supplying the single kidney, the artery having largest diameter is considered as the main artery and the rest of the arteries are known as the accessory arteries. These arteries can be divided into two categories according to how they the kidney: hiliar, entering at the hilium, and polar, reaching at the pole. (39). The most frequent accessory artery is a polar artery arising from the aorta, close to the origin of the main renal branch, and supplies the inferior renal pole. The second most frequent supplementary artery irrigates the upper pole, which is normally a small segment [40]. Some authors call polar arteries those that attain any of the kidney poles with independence of its origin. It may be helpful, strictly from a labelling point of view, to distinguish between these polar arteries, tagging them as polar branches when they arise from the main renal artery and polar accessory arteries when they have a separate origin. The importance of polar arteries is shown in the fact that they supply renal …show more content…
It has been demonstrated that, as opposed to the intrarenal arteries, the intrarenal veins show no segmental arrangement at all, there being a free anastomosis of the venous system throughout the kidney. These anastomoses occur at different levels between the stellate veins (cortex), between the arquate veins (base of the pyramids) and between the interlobar veins (close to the renal sinus). There are also anastomoses around the calyceal necks that join a longitudinal system that ends up forming big trunks that finally form the main renal