Definition

1. Noun:
   • A major cranial nerve: The vagus nerve is the tenth cranial nerve (CN X). It is a long, mixed nerve, meaning it contains both sensory (afferent) and motor (efferent) fibers.
   • A primary component of the parasympathetic nervous system: It is a crucial part of the autonomic nervous system, responsible for regulating many involuntary bodily functions, often summarized as supporting "rest and digest" activities.
   • An extensive nerve with widespread innervation: It supplies nerve fibers to and receives sensory information from numerous organs in the thorax and abdomen.

Examples of Usage

• Noun:
  • Stimulation of the vagus nerve can help reduce inflammation.
  • The doctor explained that the vagus nerve controls heart rate and digestion.
  • Damage to the vagus nerve can lead to difficulty swallowing and hoarseness.

Advanced Usage

• "Vagal tone": Refers to the activity level of the vagus nerve. High vagal tone is associated with good emotional regulation and cardiovascular health.

  • Meditation practices are believed to improve vagal tone.

• "Vagal response" or "Vasovagal syncope": A sudden drop in heart rate and blood pressure, often triggered by stress, leading to fainting, mediated by the vagus nerve.

  • The sight of blood caused a vagal response, and he nearly fainted.

Variants and Related Words

• Vagus (n): Often used interchangeably with "vagus nerve."

  • The vagus extends from the brainstem to the colon.

• Vagal (adj): Pertaining to the vagus nerve.

  • The patient experienced a vagal reflex.

• Pneumogastric nerve: An older, synonymous term for the vagus nerve, referencing its connections to the lungs and stomach.

Synonyms

• Cranial nerve X: The anatomical designation.
• Pneumogastric nerve: (Historical/alternative term)
• Wandering nerve: A descriptive synonym highlighting its long, meandering path through the body.

Related Phrases (Not phrasal verbs, but common collocations)

• Vagus nerve stimulation (VNS): A therapeutic treatment involving electrical impulses to the nerve, used for epilepsy and depression.

  • Vagus nerve stimulation is an approved therapy for drug-resistant epilepsy.

• Vagal nerve fibers: Refers specifically to the constituent parts of the nerve.

• Vagal pathway: Describes the route the nerve takes and its connections.

Noun

1. a mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera