Experimental reinnervation of a strap muscle with a few roots of the phrenic nerve in rabbits.
In order to compare application of the roots of the phrenic nerve to the ansa hypoglossi for laryngeal muscle neurotization, 1 or more roots from the phrenic nerve were implanted into the right sternothyroid (RST) muscle of rabbits (n = 36). Controls were intact animals (in which RST innervation is provided by the ansa; n = 6) and denervated ones (n = 6). At 66 +/- 2 days (mean +/- SE) after neurotization, during quiet breathing, inspiratory electromyographic activity and isometric contraction force were observed in all reinnervated RST muscles (n = 24). During maximal inspiratory effort, electromyographic activity and force increased. In animals reinnervated by the C4 root alone, forces (46.22 +/- 7.8 g) were significantly higher than in intact animals (10.83 +/- 5.0 g). Retrograde labeling proved the phrenic origin of the neurotization. Electromyography of the diaphragm was recorded. We conclude that in rabbits, neurotization of a strap muscle by 1 or 2 roots of the phrenic nerve allows inspiratory contraction, even during quiet breathing. Such inspiratory activity is not observed in sternothyroid muscles of intact animals innervated by the ansa hypoglossi.
Marie
J P
JP
Department of Otorhinolaryngology and Head and Neck Surgery, Charles Nicolle Hospital, University of Rouen, France.
Lerosey
Y
Y
Dehesdin
D
D
Jin
O
O
Tadíe
M
M
Andrieu-Guitrancourt
J
J
D000818:Animals; D004576:Electromyography; D007002:Hypoglossal Nerve / Q000637:transplantation; D018482:Muscle, Skeletal / Q000294:innervation* / Q000601:surgery*; D010791:Phrenic Nerve / Q000637:transplantation*; D011817:Rabbits; D013249:Sternum / Q000294:innervation* / Q000601:surgery*; D013961:Thyroid Gland / Q000294:innervation*