Veins not involved in spreading infection to cavernous sinus from danger area of face:
Lingual vein
Pterygoid plexus
Facial vein
Cephalic vein
A. Lingual vein and D.Cephalic vein Dangerous area of face includes upper lip and anteroinferior pa of nose including the vestibule.This area freely communicates with the cavernous sinus through a set of valveless veins,anterior facial vein and superior ophthalmic vein. Any infection of this area can this travel intracranially leading to meningitis and cavernous sinus thrombosis. Ref.Maqbool 11/e,p 172.
Nose and paranasal sinuses