The fourth, fifth and ninth cranial nerves in mammals are respectively

Options

A. (a) Oculomotor, facial and vagus
B. (b) Trigeminal, facial and spinal accessory
C. (c) Trochlear, facial and glossopharyngeal
D. (d) Trochlear, trigeminal and glossopharyngeal

Answer

To solve the question regarding the fourth, fifth, and ninth cranial nerves in mammals, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Total Number of Cranial Nerves**:
- Mammals have a total of 12 cranial nerves.

2. **List the Cranial Nerves**:
- We will list the cranial nerves in order:
1. Olfactory nerve (I) - Smell
2. Optic nerve (II) - Vision
3. Oculomotor nerve (III) - Eye movement and pupil reflex
4. Trochlear nerve (IV) - Eye movement
5. Trigeminal nerve (V) - Face sensation and chewing
6. Abducens nerve (VI) - Eye movement
7. Facial nerve (VII) - Face movement and taste
8. Vestibulocochlear nerve (VIII) - Hearing and balance
9. Glossopharyngeal nerve (IX) - Throat sensation, taste, and swallowing
10. Vagus nerve (X) - Movement sensation and abdominal organs
11. Accessory nerve (XI) - Neck movements
12. Hypoglossal nerve (XII) - Movement and sensation of the tongue

3. **Identify the Specific Nerves**:
- From the list, we need to identify:
- The 4th cranial nerve: **Trochlear nerve**
- The 5th cranial nerve: **Trigeminal nerve**
- The 9th cranial nerve: **Glossopharyngeal nerve**

4. **Compile the Results**:
- The fourth cranial nerve is Trochlear, the fifth is Trigeminal, and the ninth is Glossopharyngeal.

5. **Choose the Correct Option**:
- If provided with options, we would look for the one that lists these three nerves correctly. In this case, the correct option is D: Trochlear, Trigeminal, and Glossopharyngeal.

### Final Answer:
The fourth, fifth, and ninth cranial nerves in mammals are respectively:
- **Trochlear nerve (IV)**
- **Trigeminal nerve (V)**
- **Glossopharyngeal nerve (IX)**