[Structural organization and connections of cell ensembles of the olfactory bulb of the cat brain].

The cat cerebral olfactory tubercle (OT) includes into its composition certain cellular ensembles distinguished by means of morphological criteria. The ensembles consist of three cellular components: clusters of granular neurons (islands of Calleja), pyramid-like neurons of the layer II, situating along the periphery of the islands, and groupings made by polygonal and spindle-like neurons of the layer III. Morphometrical analysis of every of the three cellular complex components has been carried out.

[Features of the cytoarchitectonics of the periaqueductal gray of the cat midbrain].

When studying cytoarchitectonics of the midbrain periaqueductal gray (PAG) in cat four areas were distinguished: medial, dorsal, lateral rostral and lateral caudal. They differ in size and distribution density of neurons.

[Quantitative analysis of the structure of neuronal dendritic spines in the striatum using the Leitz-ASM system].

Two principal classes of striatum long axonal neurons (sparsely ramified reticular cells and densely ramified dendritic cells) were analyzed quantitatively in four animal species: hedgehog, rabbit, dog and monkey. The cross section area, total dendritic length and the area of dendritic field were measured using "LEITZ-ASM" system. Classes of neurons studied were significantly different in dogs and monkeys, while no differences were noted between hedgehog and rabbit.

[Analysis of the neuronal dendrite system of the olfactory bulb in the dog brain].

A technique was worked out for quantitative analysis of accurate neuron drawings obtained from the preparations impregnated after Golgi. The analysis (according to 13 parameters) was performed to study the dendritic system within one main class of long-axonal neurons in layer II in areas having heterogenous structures of the polyfunctional formation in the dog cerebral olfactory tubercle. The most stable parameters were demonstrated to be the linear dimension of the cell body, branching of the apical and basal dendritic systems, as well as branching of the whole neuronal dendritic system.

[The sterologic method of determining the surface area of the mammalian neocortex].

A method for calculation of the square surface area of the cerebral cortex is proposed which represents a combination of the method of averaged reconstruction after a continuous series of histological sections and the stereological method of determination of the length of any curve disposed on the surface. A comparative analysis of the proposed method with curvometrical and stereological (after Hennig's formula) method used earlier for this purpose is made taking as an example the calculation of the neocortex square surface area of some mammals. The results of calculation of the surface by the proposed method were found to coincide with curvometrical data within the range of 5% while the data obtained by stereological method of determination of the absolute square surface area differ from curvometrical data by more than 22%.