The fourth cranial nerve of man is

Options

A. Abducens
B. Trochlear
C. Auditory
D. Oculomotor

Answer

**Step-by-Step Solution:**

1. **Understanding Cranial Nerves**: Humans have 12 pairs of cranial nerves, each with specific functions related to sensory and motor control.

2. **Identifying the Fourth Cranial Nerve**: The question specifically asks for the fourth cranial nerve. To identify it, we need to list the cranial nerves in order.

3. **Listing the Cranial Nerves**: The cranial nerves are as follows:
- 1st: Olfactory
- 2nd: Optic
- 3rd: Oculomotor
- 4th: Trochlear
- 5th: Trigeminal
- 6th: Abducens
- 7th: Facial
- 8th: Vestibulocochlear
- 9th: Glossopharyngeal
- 10th: Vagus
- 11th: Accessory
- 12th: Hypoglossal

4. **Identifying the Correct Answer**: From the list, we can see that the fourth cranial nerve is the **Trochlear nerve**.

5. **Function of the Trochlear Nerve**: The trochlear nerve is responsible for motor control of the superior oblique muscle of the eye, which helps in the movement of the eyeball.

6. **Conclusion**: Based on the identification and function, the fourth cranial nerve in humans is the **Trochlear nerve**.

**Final Answer**: The fourth cranial nerve of man is the **Trochlear nerve**.

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