vocal cord muscles nerves | Anatomy2Medicine

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