The trochlear nerve also makes a direct line to the superior orbital fissure, lying on the lateral wall of the cavernous sinus. More anteriorly, the oculomotor nerve is inferior and medial to the sixth nerve and lies close to the carotid. In the posterior portion of the cavernous sinus it lies superior and lateral to the sixth nerve. The oculomotor nerve takes a direct path anteriorly to the superior orbital fissure. The third, fourth and fifth cranial nerves add to the framework and thereby complete the anatomic sketch that will become our reference. They then travel upward and laterally to enter the internal auditory meatus. The facial (VII) nerve fascicle loops around the nucleus of the sixth (VI) nerve, creating the facial colliculus, and turns anterolaterally to join the eighth nerve in its exit from the lower pons. 3).įigure 3 also contain a sketch of the position and course of the seventh and eighth cranial nerves. The abducens nerve enters the posterior aspect of the cavernous sinus, through which it travels together with the oculomotor and trochlear nerves, as well as the ophthalmic and maxillary divisions of the trigeminal nerve, and the internal carotid artery and carotid sympathetic plexus ( Fig. The nerve then runs a direct anterior course, lying medial to the trigeminal ganglion and on the lateral aspect of the internal carotid artery which enters through the foramen lacerum. Composite diagram illustrating the third through eighth cranial nerves.
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