PHYSICAL CHARACTERISTICS OF TYPICAL CHORDAE TENDINEAE OF ATRIOVENTRICULAR VALVULAR HEART APPARATUSES IN CHILDREN OF THE NEONATAL PERIOD IN NORM

Abstract

This article presents the microscopic structure and polarization characteristics of the chordae tendineae of the mitral and tricuspid heart valves of normal newborns based on histological sections.The purpose – to study histological specimens of chordae tendineae of atrioventricular heart valves of newborn children using light microscopy, as well as using the method of laser polarimetry.Material and methods. The studies were performed on 34 atrioventricular valves taken from the hearts of newborn children (from birth to the 28th day of life). The light-optical and polarization methods were used in the research.Results. The structural components of the chordae tendineae of the mitral and tricuspid heart valves of newborns in norm were studied using the morphological method and the histoarchitectonics of their components at the polarization level was established.Conclusions. Thus, the obtained data of these studies using the method of laser polarimetry completely confirmed the data of the structure of the typical chordae tendinea of the cardiac atrioventricular valvular apparatuses of newborns using light microscopy. This method makes it possible to differentiate fibrous components of the extracellular matrix of connective tissue and contractile cardiac muscle cells within the chordae tendinea, as well as to differentiate chordae tendinea into two types: fibro-muscular and fibrous.