What do the external iliac arteries primarily supply?

The external iliac arteries primarily supply the lower extremities. As they branch off from the common iliac arteries, they descend along the pelvic brim and eventually become the femoral arteries as they pass under the inguinal ligament into the thigh. The femoral arteries continue to provide blood flow to the muscles, skin, and tissues of the legs and feet, making the role of the external iliac arteries crucial for maintaining adequate blood supply to the lower limbs. The other options focus on different anatomical areas that are supplied by other arterial branches, but they do not involve the external iliac arteries directly.