Which facial muscle is not monitored for CN VII sEMG?

Prepare for the ABRET CNIM Exam. Use flashcards and multiple choice questions, each with explanations. Ready yourself for the exam day!

The masseter muscle, while innervated by the mandibular branch of the trigeminal nerve (CN V), is not part of the monitoring for facial nerve (CN VII) signal using surface electromyography (sEMG). In CN VII neurophysiological monitoring, the focus is primarily on muscles that are directly controlled by the facial nerve, which primarily includes muscles of facial expression that are associated with forehead, eyelids, and lower facial areas.

The frontalis muscle, responsible for raising the eyebrows, the orbicularis oculi, which closes the eyelids, and the mentalis muscle, which helps in pouting and elevating the lower lip, all receive innervation from the facial nerve and are monitored during surgeries to assess the integrity of this nerve. Thus, the masseter's role as a muscle of mastication does not relate to facial nerve function monitoring in the context of intraoperative procedures. Since it is not monitored in the same context as the other muscles listed, this makes it the correct choice in this scenario.

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