Biomedical subjects

L A Berezhnaia

Publications and source records attributed to L A Berezhnaia.

At least 19 recordsLinked to original sources

PubMed2006

[Primary structural moduli of the dorsal thalamic nuclei and motor cortex in man].

The aim of this work was to study the primary structural modular organization of neurons in dorsal thalamic nuclei (ventral anterior, ventral lateral, anterior medial, anterior ventral, anterior dorsal, medial, nucleus reticularis) and motor cortex (areas 4 and 6) in man using the methods of Nissl, Kluver-Barrera and Golgi silver nitrate impregnation. It was shown that in both dorsal thalamic nuclei and motor cortex neurons had regular organization--they were forming small groups or short chains and meet specific criteria. These neuronal associations, formed single structural units, that were called primary structural moduli. Comparison of primary structural moduli found in dorsal thalamic nuclei and motor cortex has demonstrated the identity of their organizational principle. The differences were only in the cells, that formed primary structural moduli. Thus, in human dorsal thalamic nuclei and motor cortex two principles of neuronal organization into primary structural moduli were detected--group and chain.

Humans↗

PubMed2005

[Neuronal organization of thalamic nucleus reticularis in adult man].

The neuronal content of human thalamic nucleus reticularis was studied in serial sections cut in sagittal and frontal projections and impregnated with silver nitrate using Golgi method. The neuronal content of human thalamic nucleus reticularis was found to be more diverse than previously reported in animals and man. Besides two types of sparsely-branched long-dendritic spineless R1 and R2 neurons, this nucleus contained spiny cells. Medium and small-sized sparsely-branched short-dendritic neurons and densely-branched spiny cells were demonstrated. The principle of organization of human thalamic nucleus reticularis is described.

Aged↗

PubMed2004

[NADPH-diaphorase positive cells of the human thalamic nuclei and internal capsule].

Isolated NADPH-diaphorase (NADPH-d)-positive neurons were demonstrated in the nuclei of human dorsal thalamus and nucleus reticularis. Staining of NADPH-d-positive neurons with all their processes and preceding study of neurons of dorsal thalamus using Golgi method enabled the identification of their types and their determination as sparsely-branched cells. Main types of efferent densely-branched neurons had no demonstrable NADPH-d activity. NADPH-d-positive neurons were represented by reticular neurons and by one type of short-axon interneurons. Capsula interna contains numerous NADPH-d-positive reticular neurons. NADPH-d-positive cells forming contacts with blood vessels were found. Thus, NADPH-d-positive cells of dorsal thalamus, reticular nucleus and capsula interna appear to be evolutionally more ancient and structurally less complex.

Humans↗

PubMed2002

[Neuronal organization of human ventral anterior and ventral lateral thalamic nuclei].

Neuronal composition was studied in two human thalamic nuclei--nucleus ventralis anterior and nucleus ventralis lateralis using serial horizontal and frontal sections stained using Kluver-Barrera and Golgi silver impregnation methods. It was found that the number of neuronal types, composing the nuclei (equal to eight) is greater than previously reported. Proposed neuronal classification based on the characteristics of their processes, in comparison with a similar study performed in dogs (pups) permitted to distinguish two types of neurons--long-axon and short-axon. Long-axon neurons are subdivided into sparsely-branched (reticular and short-dendritic) and densely-branched (arborescent, giant and medium bush-like, penicillar varieties). Short-axon neuronal type includes smooth-dendritic and "shaggy" cells.

Axons↗

PubMed1998

[The cellular structure of the islands of Calleja Magna in the brain of carnivores].

Complex study of the structure of islands of Calleja in carnivore brain (cat and dog) was conducted. Using Nissl and Golgi methods, HRP axonal transport and electron microscopy the islands were found to be composed of cells of 3 types varying in size, shape, dendrite spatial distribution and ultrastructure. The majority of cell population in the islands is formed by small granular cells with scarce medium-sized, mitral-like and larger cells among them. The administration of retrograde marker into posterolateral hypothalamus provided the evidence for the presence of cells in the islands of Calleja projecting to this area. These were found to be mitral-like cells. Other cells did not exhibit staining. The resemblance between mitral-like and granular cells of the large islands of Calleja with mitral-like and granular cells of olfactory bulb, respectively, supports our assumption that these islands compose the central sensory nucleus (presumably of the sensory terminal nerve).

Animals↗

PubMed1989

[Various principles of the organization of preterminal and terminal branches of afferent conductors in neuropil of the snail dorsal ganglia].

Character of ramifications in the preterminal and terminal axonal parts in the neuropil of the dorsal ganglia have been studied in 16 edible snails (Halix pomatia). The nervous tissue is impregnated with silver nitrate after Golgifast method. Serial sections are made in two projections: horizontal and vertical. The analysis of peculiarities of the spatial distribution of the afferent fibers (AF) demonstrates their several forms that are united into the following types: dominant, probable and transitional. Comparison of the edible snail AF with those in the higher vertebrata makes it possible to conclude that the character of ramification of their preterminal and terminal parts and principle of organizational connections of the AF with the postsynaptical structures are principally similar.

Afferent Pathways↗

PubMed1987

[Avesicular intercellular contacts in the neuropil of the ganglia of the subpharyngeal complex and in the nerves of the edible snail].

Intercellular interconnections in neuropil of dorsal ganglia in the subpharyngeal complex and nerves have been studied in a mature snail (Helix pomatia), dimensions of the shell--3.0 X 3.5 sm, after double fixation (glutaraldehyde and osmium tetraoxide) and treatment with phosphoric tungsten acid. Zones of the neuropil in the left pleural and parietal ganglia have been investigated--where the nerves leave ganglia and in the area of giant cells; neuropil of the central part of both parietal ganglia; central part of the visceral ganglion and nerves--left palial, intestinal and left pleural commissure. The most spread forms of avesicular intercellular contacts in the neuropil are symmetrical. Besides the latter, processes of the neuropil form fissural and desmosomal junctions. Localization of the avesicular contacts supposes presence of dendro-dendritic junctions of desmosomal and fissural types and axo-axonal ones--of desmosomal type. Various types of the contacts differ from each other by their ultrastructural organization.

Animals↗

PubMed1981