title: [Patterns of motor innervation of the catfish (Ictalurus nebulosus Les.) deep lateral muscle fibres (author's transl)].
abstract: 1. Some patterns of the motor innervation of the Catfish (Ictalurus nebulosus) deep lateral muscle have been investigated using the Koelle method of demonstrating cholinesterase activity and intracellular recordings. 2. In the superficial region of the muscle, facing the visceral cavity, neuro-muscular junctions are located in the middle part of the muscle fibres. Stimulating the motor nerve with shocks of increasing amplitude evokes first end-plate potentials and then typical propagated action potentials. This result supports the occurrence of at least two motor axons at each junction. 3. In the deep region of the muscle, neuro-muscular junction are confined to the ends of the muscle fibres. Individual fibres show two junctions, one at each end. Stimulating one of the two terminal junctions initiates action potentials which are propagated up to the other end of the muscle fibre.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002802:Cholinesterases / Q000378:metabolism; D004558:Electric Stimulation; D005399:Fishes / Q000033:anatomy & histology*; D008564:Membrane Potentials; D009046:Motor Neurons / Q000166:cytology / Q000502:physiology; D009132:Muscles / Q000294:innervation* / Q000502:physiology
chemical_list: D002802:Cholinesterases
vernacular_title: Etude de quelques modalités de l'innervation motrice des fibres du muscle latéral profond du poisson-chat (Ictalurus nebulosus Les.).