Single fibre action potential recording from the nerve to the musculus obliquus externus abdominis following pin-prick in humans. III.(IV).
1. With 2 pairs of wire electrodes single afferent and efferent action potentials were recorded from the whole nerve to the musculus obliquus externus abdominis in humans. 2. The peak group conduction velocity of Golgi tendon organ afferents was with about 55 m/sec at 36 degrees C intermediate to the velocities of the primary and secondary muscle spindle afferents and intermediate to the velocities of the alpha 1 and alpha 2-motoneurons. 3. Following pin-prick of the skin on top of the musculus obliquus externus abdominis, the activity of the secondary spindle afferents in the nerve to the musculus obliquus externus reduced and the activity of the primary spindle afferents disappeared. These afferent changes are interpreted as the result of the defense contraction of the muscle underlying the skin. 4. The results are discussed with respect to withdrawal reflexes measured electromyographically. A motoric reinnervation of the urinary bladder in spinal cord lesions by a nerve anastomosis is also discussed.
Schalow
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G
Ernst-Moritz-Arndt University Greifswald, Germany.
Barth
H
H
D000009:Abdominal Muscles / Q000294:innervation; D000200:Action Potentials / Q000502:physiology*; D000714:Anastomosis, Surgical; D006801:Humans; D009412:Nerve Fibers / Q000502:physiology*; D009431:Neural Conduction / Q000502:physiology; D010525:Peripheral Nerves / Q000502:physiology*; D010812:Physical Stimulation; D001743:Urinary Bladder / Q000294:innervation / Q000601:surgery