Gradenigo's triad is caused due to involvement of
Gradenigo Syndrome (GS) is classically described as a clinicaltriad of otitis media, facial pain, and abducens palsy that in the past most commonly developed from infection in the petrous temporal bone (i.e., petrous apicitis). Ref otolaryngology dhingra 3e p278
Abducens nerve
Facial nerve
Optic nerve
Vestibulocochlear nerve
Ear