G. G. Arakelov

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A structure of synaptic connections between the identified sensory and giant command neurons of Helix lucorum was studied. It was found that EPSPs arising in the giant neuron as responses to single action potentials generation in sensory neuron consist of several monosynaptic and several polysynaptic components having different magnitude, latencies, and(More)
Plastic properties of the receptive field of the identified LPa3 neurone were studied on a semi-intact snail preparation. Mantle area representing part of the vast receptive field of the LPa3 neurone of the left parietal ganglion consists of three zones. The right part of the mantle is innervated by the right pallial and anal nerves; the former transmits to(More)
The spectral sensitivity of the dark-adapted eye of the snailHelix lucorum L. was investigated in semiintact “optic cupoptic nerve-cerebral ganglion” preparations. The data of the recording of the electroretinogram in response to monochromatic radiation of varied intensities were used to plot the spectral sensitivity functions. The averaged spectral(More)
By electrophysiological and microanatomical methods of analysis of snail CNS small neurones it was shown that a number of neurones form a monosynaptic connection (MSC) with the gigantic polyfunctional neurone LPa3. By using cobalt and nickel staining, the structure of MSC cells LPa7--LPa3 was studied. Six identified synapses in two LPa3 processes zones were(More)
1. Identified neurons of the snailHelix pomatia, studied with the aid of intra-cellular injection of cobalt, have numbers and orientations of processes which are specific for each particular neuron. 2. The neurons LPa3 and RPa3 have from four to seven branches which pass into the pedal ganglia and into the peripheral nerves. A network of fine filaments is(More)
The microanatomy of the pre- and postsynaptic neurons and the structure of the monosynaptic connection LPa7- LPa3 are described on the basis of planar reconstruction of sections of preparations of the CNS of the edible snail with neurons marked by heavy metal salts. Some physiological features of the presynaptic neuron and the monosynaptic connection were(More)
Recording of the integrative electrical activity of the retina of the snail and electron microscopic study of its eye have shown the following. The electrical activity of the photoreceptors is a source of the retinogram (ERG) of the snail. ERG reaction form is characterized by two phases of a response: the initial spike and the following slow fading. For(More)
In the case of intracellular recording in the ganglia of the apple snail, neurons giving responses of similar dynamics, both in response to orthodromic stimulation and in the case of a single microionophoresis of acetylcholine (AC) to their soma, were detected. Multiple repeated applications of AC lead to extinction of the response, similar to the(More)