Electromyographic Studies of Laryngeal Paralysis and Regeneration of Laryngeal Motor Nerves in Dogs

The electromyographic activity of intrinsic laryngeal muscles during quiet breathing in the anaesthetized horse

“…Howeve.r, in contrast to Faaborg Anderson's human findings, the electrical activity in the horse increased during· in spiration. Similar electrical bethaviour during quiet respiration in this muscl<:: has been observed in anaesthetized cats (Green and Neil, 1955;Rex, 1969;Suzuki and Kirchner, 1969), dogs (Nakamura et al, 1958;Siribodhi et al, 1963) and goats (Murtagh and Campbell, 1954) but in these. species the activity ceased during expiration.…”

“…This finding is hard to equate with the opinion of most authors that the cricothyroid muscle is an adduc tor muscle of the larynx (Murtagh, 1945;Seymour and Henry, 1954;Faaborg Anderson, 1957;Siribodhi et al, 1963;Nakamura et al, 1958). Rather it is more in accord with the opinion of Hiroto et al (~964) and Suzuki et al (1970) who conSidered that the cricothyroid assisted ~he dorsal crico-arytenoid muscle in open-109 the ~lottic chink during inspiration.…”

“…Electromyographic examination of in trinsic laryngeal muscular activity has been carried out in man (Faaborg Anderson, 1957) and some experimental animals including the cat (Green and Neil, 1955;Rex, 1969), dog (Nakamura et al, 1958;Siribodhi et al, 1963), goat (Murtagh and Campbell, 1954) and mon key (Lund and Palmer, 1969). The pur pose of these investigations has been to increase understanding of the action of the laryngeal muscles and to provide: a basis on which to compare the normal individual with those suffering from neurogenic and myogenic disorders of the larynx.…”

Selective Reinnervation of the Abductor and Adductor Muscles of the Canine Larynx after Recurrent Nerve Paralysis

“…Most of them failed to show vocal cord movement. An explana tion was suggested by Siribodhi et al' in 1963: the electrical activity recorded in the reinnervated laryngeal muscles without movement of the vocal cords could result from the misdirected regenera tion of the motor axons to the adductor and abduc tor muscles. This hypothesis has been confirmed by electromyographic (EMG) studies by Dedo In 1970, Tucker et al'" reported a new technique with success in the dog: this was the neuromuscular pedicle used to reinnervate the PCA muscle with the ansa cervicalis nerve.…”

Short-term laryngeal electromyography and histopathological findings after primary reconstruction of the inferior laryngeal nerve in rabbits: prospective study

“…This is termed synkinesis. 8 Such dysfunctional ('synkinetic') recurrent laryngeal nerve reinnervation can result in chronic vocal fold paralysis due to the simultaneous contraction of antagonistic muscles, as first reported by Siribodhi et al 9 There is no consensus over the definition of synkinesis or its electromyographic signs. Similarly, there is no universally accepted method of diagnosing synkinesis: opinions differ and research is ongoing.…”