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. 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.

A. Glossopharyngeal B. Trigeminal C. Vagus D. Facial

Correct Answer is B

Explanation

A. The glossopharyngeal nerve is involved in several functions, including taste sensation on the posterior third of the tongue, salivation, and the sensation of the pharynx. It also plays a role in swallowing and gag reflex. However, it is not responsible for the movement of the jaw or clenching of the jaw.
B. The trigeminal nerve is responsible for sensation in the face and also controls the muscles of mastication (chewing). It has both sensory and motor functions. The motor branches of the trigeminal nerve, specifically the mandibular division, innervate the muscles that allow for jaw movement, including clenching.
C. The vagus nerve has a broad range of functions, including regulating heart rate, digestive tract motility, and some aspects of speech and swallowing. It does not control jaw movement or clenching, so it is not relevant to this observation.
D. The facial nerve controls the muscles of facial expression, including movements like smiling, frowning, and closing the eyes. It is not involved in the motor control of the jaw or clenching actions.

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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

Naxlex Comprehensive Predictor Exams

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Correct Answer is B

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Correct Answer is B

Explanation

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