ELECTROMYOGRAPHIC STUDIES ON THE RESPIRATORY MUSCLES OF THE DOMESTIC FOWL

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  • 家鶏の呼吸筋に関する筋電図学的研究
  • イエ ケイ ノ コキュウキン ニ カンスル キンデンズガクテキ ケンキュウ エイブン

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Abstract

With the electromyographic technique, leading and recording of a single neuromuscular unit from the respiratory muscles of the domestic fowl were carried out. Action potentials were led. off by coaxial needle electrodes or closely approximated bipolar electrodes. The results obtained are as follows. 1. The 2nd to 4th external intercostal muscles (ICM) and the 1st and 2nd internal ICM were inspiratory muscles. The 6th external and the 3rd to 6th internal ICM were expiratory mucles. The 5th external intercostal muscle was an inspiratory one in some birds and an expiratory one in others. Sometimes both inspiratory and expiratory discharges were detcted in this muscle. The behaviors of the intercartilaginous portions of the ICM were similar to those of the external ICM of the same intercostal spaces. 2. The action potentials of a single neuromuscular unit led off from these ICM were demonstrated (Fig. 1). The interval diagrams drawn from these original records showed apparently a slowly augmenting pattern in all cases. 3. All abdominal muscles participated actively in the expiratory movement. The interval diagrams of these muscles exhibited also a slowly augmenting pattern. It was characteristic of the respiratory muscles of the fowl that the expiratory muscles showed a slowly augmenting pattern. 4. The scalenus and transversus thoracis muscles were inspiratory muscles. Discharge from the muscles of the dorsal region occurred or increased in the expiratory phase in many cases, though no respiratory alternation of dischage was definite in some cases. The activity pattern of these muscles was also a slowly augmenting one. 5. The activity patterns found in the respiratory muscles of the fowl belonged to a slowly augmenting pattern or one of its modified types in many cases. A steady-state patterm was rarely observed in the expiratory muscles of the ICM.

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