title: [Effect of ammonium acetate on depolarization processes in the central terminals of primary afferents].
abstract: Experiments on cats determined that ammonium acetate injected intravenously (2-4 mM/kg) supressed the processes of primary afferent depolarization (PAD) which are thought to be responsible for the presynaptic inhibition of spinal reflexes. The supression was transient and proceeded in paralle to depression of postsynaptic inhibition of monosynaptic reflexes. Ammonium acetate slightly decreased the amplitude of the negative postsynaptic potentials recorded form the dorsal surface of lumbar cord in response to stimulation of hind limb afferent nerves and increased polysynaptic reflex discharges in appropriate ventral roots. These findings make it unlikely that the ammonium depression of PAD is a result of impairment of interneuronal activity. A suggestion is made that ammonium depression of PAD results from diminition of the EMF for synaptic currents producing PAD.
mesh_terms: D000085:Acetates / Q000494:pharmacology*; D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002415:Cats; D004594:Electrophysiology; D008564:Membrane Potentials / Q000187:drug effects; D009475:Neurons, Afferent / Q000187:drug effects*; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology*; D012023:Reflex, Monosynaptic / Q000187:drug effects; D013116:Spinal Cord / Q000187:drug effects*; D013570:Synaptic Membranes / Q000187:drug effects; D009435:Synaptic Transmission; D005680:gamma-Aminobutyric Acid / Q000502:physiology
chemical_list: D000085:Acetates; D000644:Quaternary Ammonium Compounds; D005680:gamma-Aminobutyric Acid
vernacular_title: Deĭstvie atsetata ammoniia na protsessy depoliarizatsii tsentral'nykh okonchanii pervichnykh afferentov