Which portion of the optic nerve is surrounded by dura, arachnoid, and pia mater?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which portion of the optic nerve is surrounded by dura, arachnoid, and pia mater?

Explanation:
The optic nerve is a CNS tract that carries the three meninges along most of its length, but the portion inside the eyeball is not enclosed by them. The boundary between the intraocular part and the rest of the nerve is the lamina cribrosa. After this point, the nerve in the orbit (the intraorbital, post-laminar segment) is surrounded by dura, arachnoid, and pia mater, with a subarachnoid space around it. This is the part of the optic nerve that has the complete meningeal covering, distinguishing it from the intraocular portion, which lies within the eye and is not wrapped by these membranes.

The optic nerve is a CNS tract that carries the three meninges along most of its length, but the portion inside the eyeball is not enclosed by them. The boundary between the intraocular part and the rest of the nerve is the lamina cribrosa. After this point, the nerve in the orbit (the intraorbital, post-laminar segment) is surrounded by dura, arachnoid, and pia mater, with a subarachnoid space around it. This is the part of the optic nerve that has the complete meningeal covering, distinguishing it from the intraocular portion, which lies within the eye and is not wrapped by these membranes.

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