Which nerve is NOT a component of the pharyngeal plexus?

Which nerve is NOT a component of the pharyngeal plexus?

• A. CN IX
• B. CN X
• C. CN XI
• D. CN VII

Answer: (D)

The pharyngeal plexus is a network on the outer wall of the pharynx formed by branches from the glossopharyngeal nerve and the vagus nerve, with a contribution from the cranial part of the spinal accessory nerve that joins with the vagus. Most pharyngeal muscles receive motor fibers from the vagus, while the stylopharyngeus is supplied by the glossopharyngeal nerve. The cranial portion of the spinal accessory nerve also contributes fibers to this plexus. In contrast, the facial nerve does not contribute to the pharyngeal plexus, so it is not a component.

The pharyngeal plexus is a network on the outer wall of the pharynx formed by branches from the glossopharyngeal nerve and the vagus nerve, with a contribution from the cranial part of the spinal accessory nerve that joins with the vagus. Most pharyngeal muscles receive motor fibers from the vagus, while the stylopharyngeus is supplied by the glossopharyngeal nerve. The cranial portion of the spinal accessory nerve also contributes fibers to this plexus. In contrast, the facial nerve does not contribute to the pharyngeal plexus, so it is not a component.