Lateral view of the left cavernous sinus, showing the neurovascular relations. The internal carotid artery is represented by the acronym ACI and the optic nerve by the II, while the trigeminal nerve divisions are with the initials V1, V2 and V3. The white arrow points at the oculomotor nerve, the black arrow indicates the trochlear nerve and the yellow arrow shows the abducens nerve. (Image courtesy of E de Oliveira)