Not true about facial vein is

The facial veinn is the largest vein of the face with no valves. It begins as the angular vein at the medial angle of eye. It is formed by the union of the supratrochlear and supraorbital veins. The angular vein continues as the facial vein, running downwards and backward behind the facial aery but with a straighter course. It crosses the anteroinferior angle of the masseter, pierces the deep fascia, crosses the submandibular gland, and joins the anterior division of the retromandibular vein below the angle of the mandible to form the common facial vein The latter drains into the internal jugular vein. It is represented by a line drawn just behind the facial aery. Ref BDC voume3,sixth edition pg 72