[Evidence and meaning of monophasic potentials in the electromyogram of extraocular muscles of rabbits and cats (author's transl)].
The EMG of extraocular muscles of rabbits and cats was recorded by a concentric-needle electrode provided for clinical use. The EMG showed spike activity (at least biphasic, fast waves of 1 to 2 msec duration) and characteristic long-duration monophasic waves (decline for up to 7 msec). The monophasic potentials are interpreted as local depolarizations arising at the nerve-muscle junctions of multiply innervated muscle fibers. Spike- and monophasic potentials are discharged in independent rhythms whose frequency changes when the head position is altered. The frequency of spike- and monophasic potentials are changed in the same direction by labyrinthine reflexes. Spontaneous monophasic potentials recruit at a lower threshold.
D000200:Action Potentials; D000818:Animals; D002415:Cats; D004576:Electromyography; D009469:Neuromuscular Junction / Q000502:physiology; D009801:Oculomotor Muscles / Q000502:physiology*; D011817:Rabbits; D013997:Time Factors; D014722:Vestibule, Labyrinth / Q000502:physiology
Vorkommen und Bedeutung monophasischer Potentiale im Elektromyogramm der äusseren Augenmuskeln von Kaninchen und Katze