## **Core Concept**
The question tests knowledge of cranial nerve anatomy, specifically regarding the structures through which cranial nerves pass. Dorello canal is an anatomical passage related to the base of the skull.

## **Why the Correct Answer is Right**
The **abducens nerve (CN VI)** passes through Dorello canal. This canal is located in the petrous part of the temporal bone and transmits the abducens nerve from the brainstem to the orbit. The abducens nerve is responsible for the motor innervation of the lateral rectus muscle, which is involved in eye movements.

## **Why Each Wrong Option is Incorrect**
* **Option A:** The **oculomotor nerve (CN III)** does not pass through Dorello canal; it passes through the superior orbital fissure.
* **Option B:** The **trochlear nerve (CN IV)**, like CN III, passes through the superior orbital fissure, not Dorello canal.
* **Option D:** The **trigeminal nerve (CN V)** has a complex pathway but does not pass through Dorello canal; its main divisions pass through the superior orbital fissure and the foramen rotundum.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation is that the abducens nerve (CN VI) is particularly susceptible to damage or compression as it passes through Dorello canal, which can lead to **abducens nerve palsy**. This condition results in difficulty moving the eye outward (abduction), causing diplopia (double vision).

## **Correct Answer:** . **Abducens nerve**