Uncoordinated movements of the 'eye ball is because of an injury to which cranial nerve

Options

A. III
B. V
C. VII
D. VIII

Answer

To determine which cranial nerve injury leads to uncoordinated movements of the eyeball, we will analyze the functions of the cranial nerves provided in the options.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options corresponding to cranial nerves:
- Cranial Nerve III (Oculomotor Nerve)
- Cranial Nerve V (Trigeminal Nerve)
- Cranial Nerve VII (Facial Nerve)
- Cranial Nerve VIII (Vestibulocochlear Nerve)

2. **Understand the Function of Each Nerve**:
- **Cranial Nerve III (Oculomotor Nerve)**: This nerve is primarily responsible for eye movements, including the ability to focus on objects and the movement of the eye in various directions (up, down, left, right).
- **Cranial Nerve V (Trigeminal Nerve)**: This nerve is responsible for sensation in the face and motor functions such as biting and chewing. It does not control eye movements.
- **Cranial Nerve VII (Facial Nerve)**: This nerve controls the muscles of facial expression and does not have a role in eye movement.
- **Cranial Nerve VIII (Vestibulocochlear Nerve)**: This nerve is involved in hearing and balance, and it does not affect eye movements.

3. **Determine the Correct Answer**: Since the question specifically asks about uncoordinated movements of the eyeball, the cranial nerve that is responsible for controlling eye movements is the Oculomotor Nerve (Cranial Nerve III). Therefore, an injury to this nerve would lead to uncoordinated movements of the eyeball.

4. **Conclusion**: The correct answer is Cranial Nerve III (Oculomotor Nerve).

### Final Answer:
The uncoordinated movements of the eyeball are due to an injury to Cranial Nerve III (Oculomotor Nerve).

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