Cranial Nerves Lab Evaluation at Cape Fear Community College
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Free Cranial Nerves Lab Evaluation at Cape Fear Community College Questions
1. Ketamine administration can result in nystagmus. Which of the following cranial nerves is responsible for this phenomena?
- Oculomotor
- Cranial nerve 6
- CN IV
Explanation
B. Cranial nerve 6 Cranial nerve VI (Abducens nerve) innervates the lateral rectus muscle, which abducts the eye. When ketamine is administered, it can affect ocular muscle control and cause nystagmus, including lateral gaze nystagmus. Because CN VI controls side-to-side eye movement, dysfunction or overstimulation of this pathway can contribute to the horizontal nystagmus often seen with ketamine use.
2. Which of the following cranial nerves are responsible for swallowing and vocalization?
- Facial
- Glossopharyngeal
- Hypoglossal
- CN VIII
Explanation
The glossopharyngeal nerve (CN IX) plays a key role in swallowing and vocalization by innervating the pharyngeal muscles and contributing to control of the gag reflex. It coordinates movements needed for swallowing and assists in producing sound through its motor influence on the pharynx. Damage may result in difficulty swallowing (dysphagia), loss of gag reflex, and speech changes.
3. Damage to which of the following cranial nerves can result in strabismus?
- Olfactory
- Optic
- Oculomotor
- Trochlear
- Trigeminal
Explanation
D. Trochlear The trochlear nerve (CN IV) innervates the superior oblique muscle, which controls downward and inward eye movement. Damage to CN IV causes vertical strabismus, leading to misalignment of the eyes. Patients often tilt their head to the opposite side of the lesion and report vertical diplopia, especially when walking downstairs or reading. Trochlear palsy is a well-known cause of strabismus due to impaired superior oblique muscle function.
4. Which of the following cranial nerves is responsible for lateral movement of the eye?
- CN 3
- CN 4
- CN 6
Explanation
C. CN 6 Cranial Nerve VI (Abducens nerve) innervates the lateral rectus muscle, which moves the eye laterally (away from the nose). Damage to CN VI impairs eye abduction, resulting in the affected eye drifting medially (esotropia) and causing horizontal diplopia, especially when looking toward the affected side.
5. To assess the hypoglossal nerve, the nurse asks the client to stick out their tongue and move it side-to-side.
- True
- False
- Ask the client to shrug shoulders against resistance
- Ask the client to read a Snellen chart
Explanation
The hypoglossal nerve (CN XII) controls tongue movement. The correct assessment is having the client protrude the tongue and move it side-to-side. Normal findings include smooth movement and midline protrusion. Deviation may indicate hypoglossal nerve damage on the weak side.
6. Which cranial nerve innervates the muscles involved in shoulder shrugging and in turning the head?
- Abducens
- CN X
- Accessory
- CN XII
- CN IV
Explanation
C. Accessory The accessory nerve (Cranial Nerve XI) innervates the sternocleidomastoid and trapezius muscles, which are responsible for turning the head and elevating (shrugging) the shoulders. Injury to CN XI results in weakness or inability to shrug the shoulders or rotate the head against resistance.
7. Which of the following cranial nerves is responsible for medial movement of the eye?
- CN 3
- CN 4
- CN 6
Explanation
A. CN 3 Cranial Nerve III (Oculomotor nerve) innervates the medial rectus muscle, which moves the eye medially (toward the nose). When CN III is functioning properly, the eye can adduct smoothly. Damage to this nerve results in difficulty moving the eye inward and may cause diplopia (double vision) and lateral drifting of the affected eye (strabismus).
8. Which cranial nerve elicits sensations of pain, temperature and tactile sensation?
- Glossopharyngeal
- Abducens
- Trigeminal
- Trochlear
Explanation
The trigeminal nerve (CN V) is responsible for facial sensation, including pain, temperature, and touch. It has three branches—ophthalmic, maxillary, and mandibular—which relay sensory information from the face to the brain. Damage may result in loss of facial sensation or trigeminal neuralgia causing severe face pain.
9. Deviation of the uvula indicates damage to which of the following cranial nerves:
- Hypoglossal
- Glossopharyngeal
- CN VII
- CN 8
Explanation
B. Glossopharyngeal Although the vagus nerve (CN X) is the primary nerve associated with uvular deviation, the glossopharyngeal nerve (CN IX) works closely with CN X in palatal movement and the gag reflex. Damage in this pathway results in the uvula deviating away from the side of the lesion due to unopposed pull of the intact muscles. A weak soft palate droops on the affected side, and the uvula is pulled toward the normal side.
10. Cranial nerve eight (CN VIII), auditory, consists of the following branches: Select all that apply.
- Cochlear
- Vestibular
- Maxillary
- Ophthalmic
- Mandibular
Explanation
A. Cochlear The cochlear branch carries auditory (hearing) information from the organ of Corti in the cochlea to the brainstem (cochlear nuclei). Hair cells transduce mechanical sound vibrations into neural impulses that travel via the cochlear nerve, enabling perception of pitch, loudness, and timbre. Damage to this branch commonly presents with sensorineural hearing loss, tinnitus, and difficulty understanding speech—especially in noisy environments. B. Vestibular The vestibular branch conveys balance and spatial orientation signals from the semicircular canals, utricle, and saccule to the vestibular nuclei. It detects angular and linear accelerations of the head, supporting gaze stabilization (via the vestibulo-ocular reflex) and postural control. Lesions produce vertigo, nystagmus, gait instability, and nausea, and are implicated in disorders such as vestibular neuritis and Ménière’s disease.
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