Read the following statements carefully and choose the option including correct statements only
(a)IV, VI, XI and XII cranial nerves are motor in nature.
(b)Lumbar plexus innervates chest and arms.
(c) Lateral movements of eye are controlled by 3rd cranial nerve.
(d)Cauda equina is a bunch of only cranial nerves which exit at the level of last sacral vertebra.

Options

A. (b) & (d)
B. (a) & (b)
C. (a) & (c)
D. (b) & (C)

Answer

To solve the question, we need to analyze each statement one by one to determine which ones are correct.

1. **Statement (a)**: "IV, VI, XI and XII cranial nerves are motor in nature."
- The IV cranial nerve is the trochlear nerve, which is motor.
- The VI cranial nerve is the abducens nerve, which is also motor.
- The XI cranial nerve is the accessory nerve, which is motor.
- The XII cranial nerve is the hypoglossal nerve, which is motor as well.
- **Conclusion**: This statement is **correct**.

2. **Statement (b)**: "Lumbar plexus innervates chest and arms."
- The lumbar plexus does not innervate the chest and arms; it primarily innervates the lower limbs and parts of the abdominal wall.
- **Conclusion**: This statement is **incorrect**.

3. **Statement (c)**: "Lateral movements of eye are controlled by 3rd cranial nerve."
- The lateral movement of the eye is actually controlled by the VI cranial nerve (abducens nerve), not the III cranial nerve (oculomotor nerve), which controls most eye movements including upward, downward, and medial movements.
- **Conclusion**: This statement is **incorrect**.

4. **Statement (d)**: "Cauda equina is a bunch of only cranial nerves which exit at the level of last sacral vertebra."
- The cauda equina is a bundle of spinal nerves and nerve rootlets, not cranial nerves. It is located in the lower back and does not consist solely of cranial nerves.
- **Conclusion**: This statement is **incorrect**.

Now, summarizing the correctness of the statements:
- Statement (a) is correct.
- Statements (b), (c), and (d) are incorrect.

Therefore, the option that includes only the correct statements is **option 3 (A and C)**.