see Cervical spinal nerve 6

The ophthalmic segment of the internal carotid artery, running from the distal dural ring to the posterior communicating artery (PCOM), can give rise to aneurysms 1).

A 1- or 2-mm segment of naked internal carotid artery lies between the investment of the carotid cistern and the dura of the cavernous sinus.

Ophthalmic artery.

Superior hypophyseal artery.

Peris-Celda M Da Roz L Monroy-Sosa A Morishita T Rhoton A L Jr Surgical anatomy of endoscope-assisted approaches to common aneurysm sites Neurosurgery 20141001121–144.144; discussion 144
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