title: [Short and long term depression of neuromuscular transmission in crayfish].
abstract: Following single  excitation of the abdominal giant motoneuron of crayfish, an important depression of neuro-muscular transmission is observed for about 15 mn. The time course of recovery is not modified even after low frequency (1/30 Hz) repetitive stimulation. Recovery curves obtained for different Mg++ concentration in physiological solutions show two phases of depression: short-term depression which is largely reduced in high Mg++ concentrations - thus probably depending on transmitter depletion in motoneuron terminals - long-term depression which is not modified by changing Mg++ concentration and seems to be independent of depletion.
mesh_terms: D000005:Abdomen; D000818:Animals; D003400:Astacoidea / Q000502:physiology*; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000187:drug effects; D008274:Magnesium / Q000494:pharmacology; D009046:Motor Neurons / Q000502:physiology*; D009469:Neuromuscular Junction / Q000187:drug effects / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D008274:Magnesium
vernacular_title: Dépressions à court et à long terme de la transmission neuromusculaire chea l'Ecrevisse