Which portion of the optic nerve extends into the optic chiasm?

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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 extends into the optic chiasm?

Explanation:
The part that reaches the optic chiasm is the intracranial portion. The optic nerve travels through the eye (intraocular), then the orbit (intraorbital), and then the optic canal (intracanalicular). The chiasm sits in the cranial cavity just above the pituitary, so only the segment that has entered the cranial space—the intracranial portion—extends into and meets the chiasm. The earlier segments stay before the chiasm and do not extend into it.

The part that reaches the optic chiasm is the intracranial portion. The optic nerve travels through the eye (intraocular), then the orbit (intraorbital), and then the optic canal (intracanalicular). The chiasm sits in the cranial cavity just above the pituitary, so only the segment that has entered the cranial space—the intracranial portion—extends into and meets the chiasm. The earlier segments stay before the chiasm and do not extend into it.

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