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Head and Neck
Anatomy
Cranial Nerves
CNX (Vagus Nerve)
CNX (Vagus Nerve)
Aparna Singhal, MD; H. Ric Harnsberger, MD
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TERMINOLOGY

  • Abbreviations

    • Vagus nerve: CNX

  • Definitions

    • CNX: Longest and one of most complex cranial nerves (CN) with diverse functions including parasympathetic (PS) innervation of neck, thoracic and abdominal viscera
    • Involved in autonomic regulation of cardiovascular, respiratory, and gastrointestinal systems
    • Additional innervation
      • Motor to majority of soft palate, pharynx, larynx, and palatoglossus tongue muscle
      • Visceral sensation from larynx, esophagus, trachea, thoracic and abdominal viscera
      • Sensory nerve to external tympanic membrane (TM), external auditory canal (EAC), and external ear
      • Taste from epiglottis

IMAGING ANATOMY

  • Overview

    • Intraaxial Segment

      • Cisternal Segment

        • Skull Base Segment

          • Extracranial Segment

            • Extracranial Branches in Head and Neck

              ANATOMY IMAGING ISSUES

              • Imaging Recommendations

                CLINICAL IMPLICATIONS

                • Clinical Importance

                  Related Anatomy
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                  References
                  Tables

                  Tables

                  TERMINOLOGY

                  • Abbreviations

                    • Vagus nerve: CNX

                  • Definitions

                    • CNX: Longest and one of most complex cranial nerves (CN) with diverse functions including parasympathetic (PS) innervation of neck, thoracic and abdominal viscera
                    • Involved in autonomic regulation of cardiovascular, respiratory, and gastrointestinal systems
                    • Additional innervation
                      • Motor to majority of soft palate, pharynx, larynx, and palatoglossus tongue muscle
                      • Visceral sensation from larynx, esophagus, trachea, thoracic and abdominal viscera
                      • Sensory nerve to external tympanic membrane (TM), external auditory canal (EAC), and external ear
                      • Taste from epiglottis

                  IMAGING ANATOMY

                  • Overview

                    • Intraaxial Segment

                      • Cisternal Segment

                        • Skull Base Segment

                          • Extracranial Segment

                            • Extracranial Branches in Head and Neck

                              ANATOMY IMAGING ISSUES

                              • Imaging Recommendations

                                CLINICAL IMPLICATIONS

                                • Clinical Importance