COMPARATIVE HISTO- AND CYTOLOGIC- CHARACTERISTIC OF SPINAL CORD AND SPINAL CORD KNOTS OF NECK AND CHEST DEPARTMENTS OF A DOG
The article, when using morphological, neuro-histological and morphometric methods of research, provides the peculiarities of macro- and microscopic build of spinal cord and spinal cord knots of neck and chest departments of a dog. According with the result of the research it was determined the shape and size of cross-section cut of the spinal cord. The last in neck department has oval shape, and in chest - more round. The biggest size of cross-section cut is common to the neck part of spinal cord (22,86±0,23 mm<sup>2</sup>), somehow lower indicator is the chest part - (20,88±0,25 mm<sup>2</sup>. At the same time the white matter of neck part of spinal cord has 4 times bigger size than grey matter. In the chest part - the size of white matter exceeds the grey matter for 6,6 times. Spinal cord knots of the neck part in a dog of round form, outside is covered with the well expressed connecting tissue stroma, from which inside the parenchyma of an organ goes numerous partitions. Contrary to neck, chest spinal cord knots have mainly oval form, rarely - round. According with the morphometric researches it was given a quantitative characteristics of neuron content and correlation of populations of nerve cells in the structure of grey matter of spinal cord and spinal cord knots of neck and chest departments of a dog that means expressed differentiation of nerve cells that have different form and size and, respectively, different nucleus-cytoplasm relation, depending on the morphofunctional state of nerve cells and appropriate part of neurosegment.