Which of the following is NOT one of the major regions of the optic nerve?

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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 of the following is NOT one of the major regions of the optic nerve?

Explanation:
Optic nerve regions are four: intraocular, intraorbital, intracanalicular, and intracranial. The term intralamellar isn’t a recognized regional segment of the nerve—the lamina cribrosa is a sieve-like structure at the optic nerve head, not a separate part of the nerve’s course. So this option isn’t one of the major regions. The intraocular portion lies within the eye from the optic disc to the lamina cribrosa; the intraorbital portion runs from the posterior globe to the optic canal; the intracanalicular portion travels through the optic canal; the intracranial portion continues beyond the canal to the optic chiasm.

Optic nerve regions are four: intraocular, intraorbital, intracanalicular, and intracranial. The term intralamellar isn’t a recognized regional segment of the nerve—the lamina cribrosa is a sieve-like structure at the optic nerve head, not a separate part of the nerve’s course. So this option isn’t one of the major regions. The intraocular portion lies within the eye from the optic disc to the lamina cribrosa; the intraorbital portion runs from the posterior globe to the optic canal; the intracanalicular portion travels through the optic canal; the intracranial portion continues beyond the canal to the optic chiasm.

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