Chapter 14: Cranial Nerves

Chapter 14: Cranial Nerves

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

1. Which of the following are controlled by the oculomotor nerve?
2. Superior rectus muscle that moves the eye
3. Constriction of the pupil of the eye
4. Adjusting the shape of the lens of the eye
5. Both A and B
6. A, B, and C

ANS: E

Rationale: The oculomotor nerve controls the superior, medial, and inferior rectus and inferior oblique muscles that move the eye. The oculomotor nerve also includes parasympathetic neurons that provide the efferent signals for constricting the pupil and increasing the curvature of lens of eye.

2. What is Bell’s palsy?
3. Loss of the consensual reflex
4. Increased sweating and vasodilation on one side of the face
5. Contralateral paralysis of the muscles innervated by CN VII
6. Ipsilateral paralysis of the muscles innervated by CN VII
7. Severe pain in the facial region near the jaw

ANS: D

Rationale: Bell’s palsy is ipsilateral paralysis of the muscles of facial expression caused by a lesion affecting axons of the facial nerve, CN VII.

3. First-order neurons conveying discriminative touch information from the face synapse in which of the following?
4. Ciliary ganglion
5. Trigeminal ganglion
6. Main sensory nucleus of the trigeminal nerve
7. Ventral posteromedial nucleus of the thalamus
8. Mesencephalic nucleus

ANS: C

Rationale: The main sensory nucleus of the trigeminal nerve is the site of synapse for first-order neurons conveying discriminative touch information from the face. The ciliary ganglion is the site of synapse for parasympathetic neurons innervating the ciliary muscle that increases the curvature of the lens in the eye. The trigeminal ganglion contains cell bodies of first-order neurons conveying somatosensory information from the face. The ventral posteromedial nucleus of the thalamus is the site of synapse between second and third-order neurons conveying somatosensory information from the face to the cerebral cortex. The mesencephalic nucleus receives proprioceptive information from the muscles of mastication.

4. The temporalis, medial and lateral pterygoid, and masseter muscles are innervated by which of the following?
5. Trigeminal nerve
6. Glossopharyngeal nerve
7. Accessory nerve
8. Facial nerve
9. Hypoglossal nerve

ANS: A

Rationale: The muscles of mastication (temporalis, medial and lateral pterygoid, and masseter muscles) are innervated by the trigeminal nerve.