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165.Innervation of Larynx #nerve supply of larynx and pharynx #larynx #sensory

By Dr Sujatha's ENT Classes

20 min video·en··4295 views

This is an AI-generated summary of “165.Innervation of Larynx #nerve supply of larynx and pharynx #larynx #sensory” — a 20 min YouTube video by Dr Sujatha's ENT Classes, published May 24, 2022. It condenses the full transcript into 9 key takeaways with clickable timestamps.

Summary

The vagus nerve (cranial nerve X) innervates the larynx through its superior and recurrent laryngeal branches, providing both motor and sensory functions crucial for voice and breathing.

Key Points

  • The larynx receives both motor and sensory innervation from the vagus nerve (cranial nerve X). 
  • Fibers from the vagus nerve originate in the nucleus ambiguus in the midbrain and can join with the glossopharyngeal (IX) or accessory (XI) nerves in cases of midbrain lesions. 
  • In the neck, the vagus nerve branches into the superior laryngeal nerve, recurrent laryngeal nerve, and pharyngeal nerve. 
  • The vagus nerve exits the skull through the jugular foramen and has superior and inferior (nodose) ganglia. 
  • The superior laryngeal nerve further divides into the external laryngeal nerve (motor to cricothyroid muscle and pharyngeal plexus) and the internal laryngeal nerve (sensory and secretomotor to the area above the vocal cords). 
  • The posterior branch of the RLN provides sensory innervation below the vocal cords and anastomoses with the internal branch of the superior laryngeal nerve to form Galen's anastomosis. 
  • Galen's anastomosis is clinically important for achieving complete anesthesia of the larynx, both above and below the vocal cords. 
  • The recurrent laryngeal nerve (RLN) has different courses on the right (around subclavian artery) and left (around aortic arch) sides, making the left RLN more susceptible to injury. 
  • The recurrent laryngeal nerve ascends in the tracheoesophageal groove and enters the larynx to supply all laryngeal muscles except the cricothyroid. 
165.Innervation of Larynx #nerve supply of larynx and pharynx #larynx #sensory

165.Innervation of Larynx #nerve supply of larynx and pharynx #larynx #sensory

The vagus nerve (cranial nerve X) innervates the larynx through its superior and recurrent laryngeal branches, providing both motor and sensory functions crucial for voice and breathing.

Key Points

—The larynx receives both motor and sensory innervation from the vagus nerve (cranial nerve X).
—Fibers from the vagus nerve originate in the nucleus ambiguus in the midbrain and can join with the glossopharyngeal (IX) or accessory (XI) nerves in cases of midbrain lesions.
—In the neck, the vagus nerve branches into the superior laryngeal nerve, recurrent laryngeal nerve, and pharyngeal nerve.
—The vagus nerve exits the skull through the jugular foramen and has superior and inferior (nodose) ganglia.
—The superior laryngeal nerve further divides into the external laryngeal nerve (motor to cricothyroid muscle and pharyngeal plexus) and the internal laryngeal nerve (sensory and secretomotor to the area above the vocal cords).
—The posterior branch of the RLN provides sensory innervation below the vocal cords and anastomoses with the internal branch of the superior laryngeal nerve to form Galen's anastomosis.
—Galen's anastomosis is clinically important for achieving complete anesthesia of the larynx, both above and below the vocal cords.
—The recurrent laryngeal nerve (RLN) has different courses on the right (around subclavian artery) and left (around aortic arch) sides, making the left RLN more susceptible to injury.
—The recurrent laryngeal nerve ascends in the tracheoesophageal groove and enters the larynx to supply all laryngeal muscles except the cricothyroid.
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