The angular vein formed by the junction of the frontal vein and supraorbital vein, runs obliquely downward, on the side of the root of the nose, to the level of the lower margin of the orbit, where it becomes the anterior facial vein. It receives the external nasal veins of the ala nasi, and communicates with the superior ophthalmic vein through the nasofrontal vein, thus establishing an important anastomosis between the anterior facial vein and the cavernous sinus. [ http://en.wikipedia.org/wiki/Angular_vein ]