A 16-yeаr-оld bоy is аdmitted tо the hospitаl with fever, confused mental state, and drowsiness. During physical examination, it is noted that the boy suffers from severe acne. A CT scan reveals a cavernous sinus thrombosis (blood clot) and infection. Which of the following veins would have been the probable route of ENTRY into the cavernous sinus and likely be responsible for the infection and thrombosis?