Physiological properties of adductor posterior mandibular muscle in crayfish—II. Neural control

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Abstract 1. 1. Electrical and mechanical responses of the adductor posterior mandibular muscle of crayfish, Procambarus clarkii, to stimulation of the internal mandibular nerve were examined. 2. 2. Selective staining with methylene blue showed that the muscle had quadriaxonic innervation. 3. 3. A single stimulus elicited a small and slow excitatory junctional potential (e.j.p.) of the muscle. Three stepwise changes of e.j.p. were obtained with increasing stimulus intensity. 4. 4. When stimulated repetitively at high frequencies, the e.j.p.'s were highly facilitated, and the muscle developed tension steeply. 5. 5. The results suggest that the internal mandibular nerve contained three slow axons; furthermore, this neuromuscular system is a slow system.

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