A numerical and experimental research of fluid flow structure on a model involving statistical-average bifurcations of the abdominal aorta and iliac arteries with an axisymmetric stenosis in the right common iliac artery has been conducted. It was shown that a two-vortex flow formed in the external iliac artery transforms a downstream into a four-vortex flow. The stenosis in the common iliac artery leads to formation of a recirculation zone behind it, namely, at the inner wall of the vessel. The following spatial bend of the external iliac artery leads to generation of a swirling flow in this vessel. A transitional flow, from a two-vortex to a single-vortex motion, forms in the internal iliac arteries.