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. 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.
2. How does the nurse test cranial nerve two (CN II)?
- Ask the client to identify different tastes.
- Ask the client to clench their teeth.
- Ask the client to cover each eye separately and read the Snellen chart.
- Ask the client to shrug shoulders against resistance.
Explanation
Cranial nerve II is the optic nerve, responsible for vision. The nurse tests CN II by assessing visual acuity, most commonly using a Snellen eye chart. Each eye is tested separately to identify deficits in central vision. This helps determine clarity of sight and identifies potential neurological or ocular problems such as optic neuritis or visual field loss.
3. The superior rectus, medial rectus, inferior rectus, and inferior oblique are innervated by which cranial nerve:
- Oculomotor
- Trochlear
- Abducens
Explanation
A. Oculomotor The oculomotor nerve (Cranial Nerve III) innervates the majority of the extraocular muscles: the superior rectus, medial rectus, inferior rectus, and inferior oblique. These muscles allow the eyes to move up, down, and medially, and assist in eye rotation and focusing. Damage to CN III may cause ptosis, pupil dilation, and the eye resting “down and out.”
4. Cranial nerve one (CN I), the _________, is instrumental in our sense of _________.
- vestibulocochlear nerve / balance
- trigeminal nerve / facial sensation
- olfactory nerve / smell
- optic nerve / vision
Explanation
Cranial Nerve I is called the olfactory nerve and its primary function is to carry sensory information related to smell from the nose to the brain. This nerve is responsible for detecting odors and transmitting smell signals to the brain for interpretation.
5. 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.
6. Which of the following cranial nerves innervate the parotid salivary gland?
- Facial
- Glossopharyngeal
- Hypoglossal
- CN VIII
Explanation
B. Glossopharyngeal The glossopharyngeal nerve (Cranial Nerve IX) provides parasympathetic innervation to the parotid salivary gland via the otic ganglion. This nerve stimulates saliva production from the parotid gland. Damage to CN IX can result in decreased salivation and impaired swallowing.
7. Cranial Nerve 6 innervates which of the following? Select all that apply.
- Lateral rectus
- Superior rectus
- Medial rectus
- Inferior rectus
- Superior oblique
- Inferior oblique
Explanation
A. Lateral rectus Cranial Nerve VI (Abducens nerve) innervates the lateral rectus muscle. This muscle abducts the eye, moving it outward away from the nose. When CN VI is damaged, the affected eye may drift inward (medial deviation), and the patient may experience horizontal double vision that worsens when looking toward the affected side.
8. Which of the following cranial nerves do you assess for readiness to extubate or need to block for an awake fiber optic?
- Glossopharyngeal
- Hypoglossal
- Facial
- Spinal accessory
Explanation
A. Glossopharyngeal The glossopharyngeal nerve (CN IX) provides sensation to the posterior tongue, soft palate, and oropharynx, playing a key role in the gag reflex and airway protective reflexes. Before extubation, airway competence must be confirmed—adequate gag reflex and swallowing ability indicate readiness. During an awake fiber-optic intubation, the glossopharyngeal nerve is often blocked to reduce gagging and improve patient comfort.
9. Frontal lobe lesions or cribriform or ethmoid bone trauma can potentially cause damage to which of the following cranial nerves?
- Olfactory
- Optic
- Oculomotor
- Trochlear
- Trigeminal
Explanation
A. Olfactory The olfactory nerve (Cranial Nerve I) passes through the cribriform plate of the ethmoid bone. Trauma to this area—such as head injury impacting the frontal lobe or fractures through the cribriform plate—can shear the olfactory nerve fibers, resulting in loss of smell (anosmia). This nerve is highly vulnerable in anterior skull base fractures and frontal head trauma due to its direct connection to the frontal lobe and its passage through delicate bony foramina.
10. Papillaedema, loss of vision, or a blurred optic disc are pathological findings of which of the following cranial nerves?
- Olfactory
- Optic
- Oculomotor
- Trochlear
- Trigeminal
Explanation
B. Optic The optic nerve (Cranial Nerve II) carries visual information from the retina to the brain. Papilledema, blurred optic disc, and loss of vision are hallmark findings of optic nerve involvement. These findings typically indicate increased intracranial pressure or direct damage to the optic nerve. Changes at the optic disc are seen during fundoscopic exam and signal pathology affecting visual transmission.
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