"The sciatic (or axial) vein is an embryonic lower-limb vein that drains the lower thigh to the internal iliac vein, and usually regresses before birth 4. The persistent sciatic vein follows the course of the sciatic nerve in the posterior lower limb and drains the lower thigh into the common iliac vein 5. It may have no valves, predisposing to chronic venous insufficiency."
Expected headings
"Terminology"
"Persistent sciatic vein is one of two known embryonic veins in the lower limb, which may persist; the other is the lateral marginal vein."