A common misconception states that the facial vein has no valves, but this has been contradicted by recent studies.
Its walls are not so flaccid as most superficial veins.
From its origin it runs obliquely downward and backward, beneath the zygomaticus major muscle and zygomatic head of the quadratus labii superioris, descends along the anterior border and then on the superficial surface of the masseter, crosses over the body of the mandible, and passes obliquely backward, beneath the platysma and cervical fascia, superficial to the submandibular gland, the digastricus and stylohyoideus muscles.
Bloodvessels of the eyelids seen from the front
Anatomy of the human head seen from the side