Which of the following tests would be most appropriate for the nurse to use when assessing motor function of the trigeminal nerve?

Assess dilatation of pupils with direct light.

Ask the client to differentiate between sharp and dull sensations on the client's face.

Palpates temporal and masseter muscles while client clenches teeth.

Have the client smile, frown, and wrinkle the forehead.

Answer and Explanation

The Correct Answer is C

A.   This test assesses the function of the oculomotor nerve (CN III), not the trigeminal nerve. The oculomotor nerve controls the constriction and dilation of the pupils, as well as some eye movements. Therefore, this choice is not appropriate for assessing the trigeminal nerve.
B.   This test assesses the sensory function of the trigeminal nerve (CN V). The trigeminal nerve provides sensation to the face, and testing the ability to differentiate between sharp and dull sensations evaluates

the sensory component of this nerve. However, this test does not assess the motor function of the trigeminal nerve.
C.   This test evaluates the motor function of the trigeminal nerve. The trigeminal nerve controls the muscles involved in chewing, including the temporal and masseter muscles. By palpating these muscles while the client clenches their teeth, the nurse assesses the strength and function of these muscles, which are innervated by the trigeminal nerve. This is a direct test of motor function for CN V.
D.   This test assesses the function of the facial nerve (CN VII), which controls the muscles of facial expression. It is not relevant for assessing the trigeminal nerve, which is involved in both sensory functions of the face and motor functions related to chewing.

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Correct Answer is B

Explanation

A. The trigeminal nerve (CN V) primarily controls sensation in the face and the muscles of mastication (chewing). While it is crucial for sensory input and motor control related to chewing, it does not directly control the movement of the tongue.
B. The hypoglossal nerve (CN XII) is responsible for controlling the movements of the tongue. A lesion of CN XII can cause the tongue to deviate towards the side of the weakness or damage. This is because the hypoglossal nerve innervates the muscles of the tongue, and damage to it results in weakness of the muscles on the affected side, causing the tongue to deviate towards that side when protruded.
C. The facial nerve (CN VII) controls the muscles of facial expression. While it affects facial movements and expressions, it does not control the movements of the tongue. A lesion in CN VII would typically result in facial asymmetry or weakness rather than tongue deviation.
D. The olfactory nerve (CN I) is responsible for the sense of smell. It does not have any role in controlling tongue movement. Therefore, a lesion in CN I would not cause deviation of the tongue.

A. Coma B. Lethargy C. Obtunded D. Stupor

Correct Answer is B

Explanation

A. Coma is a state of profound unconsciousness where the patient cannot be awakened and does not respond to any stimuli, including verbal commands or physical stimuli.

B. Lethargy is characterized by a state of drowsiness or fatigue where the patient may fall asleep easily but can be roused to respond appropriately when stimulated. The patient shows decreased alertness but is still capable of engaging with stimuli.
C. Obtunded refers to a state where the patient has reduced alertness and responsiveness. They may respond slowly and require increased stimulation to achieve a response. They are less aware of their environment and have dulled senses.
D. Stupor is a state of near-unconsciousness where the patient can only be awakened by vigorous or painful stimuli. They may not respond to verbal commands but may show some response to more intense stimuli.

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Which of the following tests would be most appropriate for the nurse to use when assessing motor function of the trigeminal nerve?

Nursing Test Bank

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