Which of the following cranial nerves in man is both sensory and motor ?

Options

A. Optic
B. Olfactory
C. Trigeminal
D. Auditory

Answer

To determine which cranial nerve in humans is both sensory and motor, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Cranial Nerves**:
- Cranial nerves can be classified into three types: sensory, motor, and mixed. Mixed nerves are those that have both sensory and motor functions.

2. **Identify the Total Number of Cranial Nerves**:
- There are a total of 12 pairs of cranial nerves in humans.

3. **List the Mixed Cranial Nerves**:
- Out of the 12 cranial nerves, 4 are classified as mixed nerves. These are:
- 5th cranial nerve: Trigeminal nerve
- 7th cranial nerve: Facial nerve
- 9th cranial nerve: Glossopharyngeal nerve
- 10th cranial nerve: Vagus nerve

4. **Identify the Functions of Each Nerve**:
- The trigeminal nerve (V) is responsible for sensation in the face and motor functions such as biting and chewing.
- The facial nerve (VII) controls the muscles of facial expression and conveys taste sensations.
- The glossopharyngeal nerve (IX) is involved in taste and swallowing.
- The vagus nerve (X) controls functions of the heart, lungs, and digestive tract.

5. **Evaluate the Options Given**:
- The question likely provides options for cranial nerves. We need to identify which of the options is a mixed nerve.
- Common options might include:
- Optic nerve (II) - Sensory only
- Olfactory nerve (I) - Sensory only
- Trigeminal nerve (V) - Mixed (Correct Answer)
- Auditory nerve (VIII) - Sensory only

6. **Select the Correct Answer**:
- Based on our analysis, the correct answer is the **Trigeminal nerve (V)**, as it is the only option listed that is both sensory and motor.

### Final Answer:
The cranial nerve in humans that is both sensory and motor is the **Trigeminal nerve (V)**.

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