Posterolateral view of the left cavernous sinus, showing the neurovascular relations. Observe the optic nerve and the three divisions of the trigeminal nerve (V1, V2, V3). The red arrow points the internal carotid artery, the white arrow shows the oculomotor nerve, the black arrow indicates the trochlear nerve, and the yellow arrow points at the abducens nerve. (Image courtesy of E de Oliveira)