Nucleus Ambiguus

Summary

The nucleus ambiguus is a group of neurons in the medulla that coordinates the muscle contractions of the palate, pharynx, and larynx to aid in swallowing. It accomplishes this by sending motor fibers to muscles via the Glossopharyngeal, Vagus, and Accessory nerves.

Key Points

• Nucleus Ambiguus
  • Cranial nerve nucleus
  • Function
    • Coordinates palate elevation and swallowing
      • Motor innervation of pharynx, larynx, and upper esophagus
  • Nerve fibers carried by
    • Glossopharyngeal Nerve (CN IX)
    • Vagal Nerve (CN X)
    • Accessory Nerve (CN XI)