Motor innervation to the tonsils is provided by which nerve?

Motor innervation to the tonsils is provided by which nerve?

• A. Glossopharyngeal nerve
• B. Internal branch of the superior laryngeal nerve
• C. External branch of the superior laryngeal nerve
• D. Recurrent laryngeal nerve

Answer: (A)

Motor control in the tonsillar region comes from the glossopharyngeal nerve because it innervates the stylopharyngeus muscle. Stylopharyngeus rises and shortens the pharynx during swallowing and sits in the walls around the tonsillar area, so its motor supply is what links IX to this region. The other nerves listed come from the vagus or its branches and mainly handle laryngeal muscles or laryngeal sensation, not the tonsillar region, so they don’t provide motor innervation to the tonsils.

Motor control in the tonsillar region comes from the glossopharyngeal nerve because it innervates the stylopharyngeus muscle. Stylopharyngeus rises and shortens the pharynx during swallowing and sits in the walls around the tonsillar area, so its motor supply is what links IX to this region. The other nerves listed come from the vagus or its branches and mainly handle laryngeal muscles or laryngeal sensation, not the tonsillar region, so they don’t provide motor innervation to the tonsils.