Question
Which of the following cranial nerves is not a content of the superior orbital fissure?
| A. |
III |
| B. |
IV |
| C. |
II |
| D. |
VI |
Show Answer
|
Correct Answer � C Explanation |
 |
The superior orbital fissure is an important structure located between the greater and lesser wings of the sphenoid bone. It serves as a passageway for multiple cranial nerves and vessels into the orbit.
However, the optic nerve (CN II) does not pass through the superior orbital fissure; it instead passes through the optic canal, a separate opening.
Structures Passing Through the Superior Orbital Fissure:
Cranial nerves:
- Oculomotor nerve (CN III)
- Trochlear nerve (CN IV)
- Abducens nerve (CN VI)
- Ophthalmic division of the trigeminal nerve (CN V1) – splits into the nasociliary, frontal, and lacrimal branches.
Vessels: Superior ophthalmic vein.
Structures Passing Through the Optic Canal:
Optic nerve (CN II) & Ophthalmic artery
Pearls for Exams:
- The optic nerve and ophthalmic artery are exclusive to the optic canal.
- The superior orbital fissure is a key route for cranial nerves involved in extraocular movement (CN III, IV, and VI) and sensation (CN V1).
