#oculomotor #anatomy #cavernous
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The oculomor nerve is the third cranial nerve and is purely motor.
The oculomotor nerve originates from the oculomotor nucleus at the level of the superior colliculus in the midbrain. The oculomotor nucleus is located ventral to the periaqueductal grey matter. Fibers from the oculomotor nucleus pass through the red nucleus then pass through the medial part of substantia nigra , exiting through the interpeduncular fossa. On emerging from the midbrain, the oculomor nerve passes between the superior cerebral artery located superior to the nerve, and superior cerebellar artery located bellow the nerve.
The nerve enters the lateral wall of cavernous sinus traversing it in its superior part.
Before leaving the lateral wall of cavernous sinus the oculomotor nerve splits into a superior division and an inferior division. Those two divisions will enter the orbit via the superior orbital fissure.
The superior division is smaller and supplies the superior rectus muscle and the levator palpebrae superioris muscle.
The inferior division of the oculomotor nerve, the larger, divides into three branches. Branch to medial rectus, branch to inferior rectus, and the third branch which is the longest goes to the inferior oblique muscle.