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Specifics of laryngeal motor innervation

, : Specifics of laryngeal motor innervation. Fiziologicheskii Zhurnal SSSR Imeni I M Sechenova 69(4): 481-488

Electromyography revealed the crossed motor innervation of the larynx in dogs. Unilateral transection of the inferior laryngeal nerve or its branches caused disapperance of electrical activity in the denervated inner laryngeal muscles and immobility of the vocal cord at the transection side and its paramedian transposition. Within 6 or more mo. after the transection, the periodic electrical activity occurring mainly in the abducting muscles in inhalation and in adducting ones in exhalation was restored. The vocal cord remained in the same position. Transection of the inferior laryngeal nerve on the other side caused disappearance of the electrical activity not only in the laryngeal muscles innervated by this particular nerve but also in analogous contralateral muscles where the nerve had been cut long ago. Single electrical stimuli applied to the peripheral part of the cut inferior laryngeal nerve induced biphasic electrical responses in the inner laryngeal muscles on both sides. Findings suggest existence of crossed motor innervation of the inner laryngeal muscles, apart from their homolateral motor innervation.

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