[Properties of extracellular monosynaptic potential of a single afferent in the light of the theory of dendrites with N-shaped volt-ampere characteristics].
In the frog tectum mass extracellular monosynaptic PSP of the set of synapses of one individual afferent--the quantum of EEG--was registered. Using the electrical threshold stimulation of the retina we noticed a large pair facilitation. The radial decline of the facilitated quantum of EEG was measured in order to check the conclusions of the dendritic theory which postulates the N-shaped current-voltage characteristic of the membrane. Therefore, we synchronously derived conditional and test quanta of EEG in the centre and 40-60 microns peripherally of terminal axonal arborization. In a half of the experiments the test quantum of EEG twice as large as the conditional one radially declined 25% less. The half-width and rise-time of the test quantum of EEG were longer as compared with the conditional one, especially in the peripheric derivation, the difference being about 1 ms. The totality of our results agrees with the concept of electrically excitable inward current in non-synaptic membrane of the apical dendrites in the tectum. The current is predicted by the theory of the N-shaped current-voltage characteristic of dendrites.
Gutman
A M
AM
Kuras
A V
AV
Khusainovene
N P
NP
D000200:Action Potentials; D000818:Animals; D003712:Dendrites / Q000502:physiology*; D004569:Electroencephalography; D009475:Neurons, Afferent / Q000502:physiology*; D011896:Rana temporaria; D013570:Synaptic Membranes / Q000502:physiology*
Svoĭstva vnekletochnogo monosinapticheskogo potentsiala odinochnogo afferenta v svete teorii dendritov s N-obraznoĭ vol't-ampernoĭ kharakteristikoĭ.