Relations
In the neck, its origin is superficial, being covered by the integument, platysma, and fascia; it then passes beneath the digastric and stylohyoid muscles and part of the submandibular gland, but superficial to the hypoglossal nerve.
It lies upon the middle pharyngeal constrictor and the superior pharyngeal constrictor, the latter of which separates it, at the summit of its arch, from the lower and back part of the tonsil.
On the face, where it passes over the body of the mandible, it is comparatively superficial, lying immediately beneath the dilators of the mouth. In its course over the face, it is covered by the integument, the fat of the cheek, and, near the angle of the mouth, by the platysma, risorius, and zygomaticus major. It rests on the buccinator and levator anguli oris, and passes either over or under the infraorbital head of the levator labii superioris.
The anterior facial vein lies lateral/posterior to the artery, and takes a more direct course across the face, where it is separated from the artery by a considerable interval. In the neck it lies superficial to the artery.
The branches of the facial nerve cross the artery from behind forward.
The facial artery anastomoses with (among others) the dorsal nasal artery of the internal carotid artery.
Read more about this topic: Facial Artery
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