Which cranial nerve carries motor control for voice and soft palate and conveys visceral sensory information from the thorax and abdomen?

Which cranial nerve carries motor control for voice and soft palate and conveys visceral sensory information from the thorax and abdomen?

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

Answer: (B)

This question tests recognizing that the vagus nerve provides the motor control for voice and soft palate and also carries visceral sensory information from the thorax and abdomen. The intrinsic laryngeal muscles that move the vocal cords, essential for phonation, are innervated predominantly by branches of the vagus nerve (the recurrent laryngeal nerve and related branches). Movements of the soft palate, which help shape resonance and seal the nasopharynx during swallowing and speech, are also largely supplied by CN X via the pharyngeal plexus (with one exception—the tensor veli palatini being supplied by V3). At the same time, the vagus carries visceral sensory afferents from thoracic and much of the abdominal viscera and provides parasympathetic output to these regions, giving it the broad visceral sensory role described. No other cranial nerve combines both control of voice/soft palate muscles and extensive visceral sensory input from the thorax and abdomen, so this nerve best fits the statement.

This question tests recognizing that the vagus nerve provides the motor control for voice and soft palate and also carries visceral sensory information from the thorax and abdomen. The intrinsic laryngeal muscles that move the vocal cords, essential for phonation, are innervated predominantly by branches of the vagus nerve (the recurrent laryngeal nerve and related branches). Movements of the soft palate, which help shape resonance and seal the nasopharynx during swallowing and speech, are also largely supplied by CN X via the pharyngeal plexus (with one exception—the tensor veli palatini being supplied by V3). At the same time, the vagus carries visceral sensory afferents from thoracic and much of the abdominal viscera and provides parasympathetic output to these regions, giving it the broad visceral sensory role described. No other cranial nerve combines both control of voice/soft palate muscles and extensive visceral sensory input from the thorax and abdomen, so this nerve best fits the statement.