Topographoanatomic features and histochemical changes in thymus of germ and forebrain in the prenatal period of the human in the prenatal period

In this study, histochemical changes were studied and topographic anatomical relationships of thymus (T) germs and prenatal human fetus in the prenatal period with general histological, cytotoxic and lectinogenic chemical methods were analyzed for the study of the development and the possibility of argumentation of the source of epithelium swelling of the digestive tract; graphic and plastic reconstructions, macroscopic painting. It is established that for organogenesis of T during the embryonic period it is characteristic of: loss of connections with the pharynx, close interaction of paired gums with each other, with topographic anatomically adjacent organs and with vascular-nervous formations of this area (thyroid and parathyroid glands, larynx, pharynx, esophagus; aorta, carotid arteries, trunks of the vagus nerve, inferior and superior laryngeal nerves). The dimensions of the rudiments and the form of T of this age period are dynamically changing depending on the process of growth (lowering) of the rudiments. For T the latter are correlated with the formation of large vessels and nerve trunk of the neck. The displacement of the rudiments of the T is by lateral walls of the formed and recognized common carotid arteries and the medial surfaces of the vagus nerves in the ventrocaudal direction. There is an asynchronous lowering of the rudiments of the particles of the T, since the left embryo of the particle with its displacement outstrips the right. It should be noted that during the course of the study we did not detect congenital malformations of the development of T, which, obviously, was the result of the proper selection of the research material and use in the future. Prospects for further development are the study of the laws of the structure and the formation of the fetal gland and structures of different systems in the fetal of human perinatal ontogenesis.