Trochlear nerve supplies

Options

A. Superior rectus
B. Inferior oblique
C. Superior oblique
D. Nasal epithelium

Answer

**Step-by-Step Solution:**

1. **Identify the Trochlear Nerve**: The trochlear nerve is one of the cranial nerves, specifically the fourth cranial nerve (CN IV). It is primarily responsible for motor functions.

2. **Function of the Trochlear Nerve**: The main function of the trochlear nerve is to control the movement of a specific muscle in the eye.

3. **Muscle Innervated by the Trochlear Nerve**: The trochlear nerve innervates the superior oblique muscle of the eye. This muscle plays a crucial role in the movement of the eyeball, particularly in downward and lateral movements.

4. **Crossing of Nerve Fibers**: The fibers of the trochlear nerve cross in the midbrain before they exit. This means that the trochlear nerve from one side of the brain controls the superior oblique muscle on the opposite side of the body.

5. **Conclusion**: Based on the information, the trochlear nerve supplies the superior oblique muscle. Therefore, the correct answer is option C: superior oblique.

**Final Answer**: The trochlear nerve supplies the superior oblique muscle (Option C).

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