Gulnara Z Mikhailova

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The structural mechanisms that control the neuronal functional activity maintaining the brain functional asymmetry were studied using the relationship between the function and structure of goldfish Mauthner neurons (MNs) responsible for fish motor asymmetry as a model. It was shown for the first time that the dominant activity in one of the two counter(More)
Three-dimensional reconstruction was used to study the structural correlates of significant increases in the activity of Mauthner neurons (MN) deafferented after unilateral enucleation of the eye evidenced by an irreversible shift in motor asymmetry in goldfish towards the “blind” side. The results showed that in some cases, the dominance of the MN(More)
Immunogold labeling was used to identify serotoninergic synapses of the chemical and mixed types on the ventral dendrite (VD) of Mauthner neurons (MN) in goldfish. These had the characteristic feature that they contained several mitochondria in the bouton and, apart from an active zone (AZ), had an obligatory desmosome-like contact (DlC). The AZ of these(More)
We have previously shown that contralateral optokinetic (visual) stimulation (COS) evokes inversion of motor asymmetry in goldfish and three-fold reductions in the volume of the ventral dendrite of the ipsilateral Mauthner neuron (MN). A training regime consisting of repeated daily sessions of COS induced resistance of the motor behavior of the fish to this(More)
Previous studies have shown that contralateral (to the preferred turning side) optokinetic stimulation and ipsilateral enucleation of the eye lead to significant (by a factor of 2–4) decreases in the volume of the ventral dendrite (VD) in one of the two Mauthner neurons (MN) of the goldfish, which becomes functionally more active. We report here our studies(More)
Goldfish are known to exhibit motor asymmetry due to functional asymmetry of their Mauthner neurons that induce the turns to the right or left during free swimming. It has been previously found that if the less active neuron is subjected to prolonged aimed visual stimulation via its ventral dendrite, the motor asymmetry of goldfish is inverted, testifying(More)
Using the three-dimensional computer reconstruction from serial histological sections, the morphology of right and left Mauthner cells (MC) was examined in the goldfish fry which demonstrated clearly pronounced preference to turn to the right or to the left in a narrow water channel or which did not show any asymmetry in choosing the side of turning.(More)
It was previously shown that the contralateral (relative to preferred side of turns) optokinetic stimulation and ipsilateral eye enucleation cause a significant, 2- to 4-fold reduction of the ventral dendrite (VD) volume in one of two goldfish Mauthner neurons (MN) that becomes more active functionally. In this study, we investigated the MN ultrastructure(More)
We studied the correlation between functional activity and 3D structure of Mauthner neurons (MNs) of the goldfish in the norm, after isolated application of an aggregated fragment of beta-amyloid 25-35 (Aβ25-35), and a combination of such application with optokinetic stimulation of the fish. It was shown that the clear correlation between the structure and(More)
Three-dimensional computer reconstruction working from serial histological sections was used to study the morphology of the right and left Mauthner neurons (MN) in goldfish fry showing marked preferences to turn stably to the right or left in a narrow water channel or showing no asymmetry in their choice of side during turns. Visually, fish with left-sided(More)