Optic dural sheath
The optic dural sheath forms the central portion of the orbit.
The optic dural sheath contains three portions: the intracranial, the intracanalicular and the intraorbital segment. Each one has specific anatomic relations which result in particular surgical considerations 1).
1)
Francois P, Lescanne E, Velut S. The dural sheath of the optic nerve:
descriptive anatomy and surgical applications. Adv Tech Stand Neurosurg.
2011;36:187-98. doi: 10.1007/978-3-7091-0179-7_7. PubMed PMID: 21197611.