vocal cord muscles nerves | Anatomy2Medicine
vocal-cord-paralysis

vocal cord muscles nerves

    • Recurrent Laryngeal Nerve
      • Innervates all of the intrinsic muscles of the larynx except the cricothyroid

 

  • cricothyroid is innervated by the external laryngeal branch of the superior laryngeal branch of the vagus nerve.

 

      • Supplies sensory innervation below the vocal cord.
      • Has a terminal portion above the lower border of the cricoid cartilage called the inferior laryngeal nerve.
      • Lesion of the recurrent laryngeal nerve
        • could be produced

 

  • during thyroidectomy or cricothyrotomy

 

          • by aortic aneurysm
        • may cause

 

  • respiratory obstruction

 

          • hoarseness
          • inability to speak

 

  • loss of sensation below the vocal cord.
  • Superior Laryngeal Nerve

 

      • Is a branch of the vagus nerve
      • divides into the internal and external laryngeal branches.

 

  • Internal Laryngeal Nerve

 

          • Innervates
            • mucous membrane above the vocal cord

 

  • taste buds on the epiglottis.

 

          • Is accompanied by the superior laryngeal artery
          • pierces the thyrohyoid membrane.
          • Lesion of the internal laryngeal nerve results in
            • loss of sensation above the vocal cord
            • loss of taste on the epiglottis.
        • External Laryngeal Nerve
        • Innervates the

 

  • Cricothyroid

 

          • inferior pharyngeal constrictor (cricopharyngeus part) muscles.
        • Is accompanied by the superior thyroid artery.
        • Lesion of the external laryngeal nerve
          • may occur during thyroidectomy because the nerve accompanies the superior thyroid artery
          • It causes paralysis of the cricothyroid muscle, resulting in
            • paralysis of the laryngeal muscles
            • inability to lengthen the vocal cord
            • loss of the tension of the vocal cord.

 

  • Such stresses to the vocal cord cause a fatigued voice and a weak hoarseness.

 

 

vocal cord muscles nerves

vocal cord muscles nerves