MORPHOLOGICAL CHANGES OF NERVOUS NODES OF THE SEXUAL SYSTEM OF DOMESTIC ANIMALS
The age-related changes in the morphology of the nerve nodes of the reproductive system of cows were studied by comparative morphometric analysis. The material for the study was obtained from pregnant Holstein cows of four age groups - from the onset of pregnancy to 7 months. The age-related features of the morphology of the circulatory, cervical, caudal mesenteric and rectus ganglia of pregnant cows were studied. It has been proven that the pregnancy of cows is accompanied by a noticeable increase in size, increase in reactivity and physiological loss of neurons of the circulatory, circulating, and caudal mesenteric ganglia. The nuclear-cytoplasmic ratio in the neurons of the studied ganglia decreases with age and in the second half of pregnancy. The number and size of the nucleoli in the nucleus also decreases, and increases in the ganglia of the reproductive organs of pregnant animals. These changes are an indirect indicator of the level of metabolism in neurons. The cytoarchitecture of the caudal mesenteric node of the studied animals is characteristic of the sympathetic ganglia, and the rectangular nodes of the pelvic plexus are parasympathetic. Analysis of the cyto- and myeloarchitectonics of the vegetative ganglia gives reason to consider them as reflex centers having their own afferent link in the form of neurons of the second type of Dogel