Which of the following would be considered a motor cranial nerve only?Question 18Answera.Olfactoryb.Trigeminalc.Opticd.Accessory

To determine which of the given options is a motor cranial nerve only, we need to analyze the functions of each cranial nerve listed:

1. Olfactory (A): This nerve is responsible for the sense of smell and is purely sensory, not motor.

2. Trigeminal (B): This nerve has both sensory and motor functions. It is responsible for sensation in the face and motor functions such as biting and chewing.

3. Optic (C): This nerve is responsible for vision and is purely sensory, not motor.

4. Accessory (D): This nerve is considered a motor cranial nerve as it primarily innervates muscles involved in head movement, such as the sternocleidomastoid and trapezius muscles.

Final Answer

Therefore, the correct answer is d. Accessory.