Histological disorders of neurons of phylogenetically different parts of the cerebral cortex in partial, subtotal, stepwise subtotal, and total cerebral ischemia

Lizaveta I. Bon; Nataliya Y. Maksimovich

doi:10.20883/medical.e493

Authors

Lizaveta I. Bon Grodno State Medical University, Grodno, Belarus https://orcid.org/0000-0001-7189-0838
Nataliya Y. Maksimovich Department of Pathological Physiology named after D.A. Maslakov, Grodno State Medical University, Grodno, Belarus https://orcid.org/0000-0003-3181-9513

DOI:

https://doi.org/10.20883/medical.e493

Keywords:

cerebral ischemia, parietal cortex, neurons, rats, hippocampus

Abstract

Aim. Measure of the histological changes in neurons in the parietal cortex and hippocampus of rats with partial, subtotal, stepwise subtotal, and total cerebral ischemia.

Material and Methods. Studies were performed on 84 rats. Partial cerebral ischemia was modelled by ligation of one common carotid artery. Subtotal cerebral ischemia was modelled by ligation of both common carotid arteries. Stepwise subtotal cerebral ischemia was performed by sequential ligation of both common carotid artery with 7-day, 3-day or 1-day intervals. Total cerebral ischemia (CI) was modelled by decapitation.

Results. When comparing the morphological changes of neurons in the parietal cortex and hippocampus, we observed that, with the aggravation of the severity of cerebral ischemia, there was a progressive increase in the number of hyperchromic shrivelled neurons and neurons with pericellular oedema. Modelling of more severe types of ischemic damage lead to pronounced morphological changes in neurons – a decrease in size, deformation of the perikaryon, and increase in the degree of neuronal chromatophilia with their wrinkling.

Conclusions. The smallest morphological changes in neurons were noted in the partial cerebral ischemia groups and subgroup 1 of stepwise subtotal cerebral ischemia, with an interval between common carotid artery dressings of 7 days. The most obvious morphological changes were observed in the conditions of total cerebral ischemia after 1 day. Changes in the parietal cortex and hippocampus were unidirectional, but in the parietal cortex, which is most sensitive to oxygen deficiency, they were more pronounced.

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Author Biographies

Lizaveta I. Bon, Grodno State Medical University, Grodno, Belarus

Lizaveta I. Bon
Candidate of biological science, assistant professor of Pathophysiology Department named after D.A. Maslakov, Grodno State Medical University
е-mail: asphodela@list.ru
Grodno State Medical University, 80, Gorky St., 230009, Grodno, Belarus
Phone: +375336878764

Nataliya Y. Maksimovich, Department of Pathological Physiology named after D.A. Maslakov, Grodno State Medical University, Grodno, Belarus

Doctor of Medical Science, professor, head of the Department of Pathological Physiology named after D.A. Maslakov, Grodno State Medical University

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