Zur Reflexinnervation der inneren Kehlkopfmuskeln

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Abstract
On excitation with single square wave shocks of the superior laryngeal nerve and the recurrent nerve in patients undergoing total extirpation of the larynx because of cancer, a reflex potential can be recorded from the laryngeal muscles. This reflex potential shows the criteria characteristic for the reflex potential arising on excitation of spindles or the afferents of muscle spindles (I-a-fibres) in limb muscles. The results described prove that muscle stretch receptors must be present in human internal laryngeal muscles. Considering the great number of motor units activated on exitation of afferent fibres it may be assumed that monosynaptic reflex control of laryngeal muscle function is no less important than for the movements of limbs. The pathway of afferent fibres for the main part is via the superior laryngeal nerve but there seems to be an indication of a small part of afferents in the recurrent nerve also.

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