MACROMICROSCOPIC ANATOMY AND MICROTOPOGRAPHY OF HUMAN THYROID GLAND IN THE INTERMEDIATE FETAL PERIOD OF ONTOGENESIS

Abstract

The aim: to describe the macromicroscopic anatomy and microtopography of a thyroid gland in the interim fetal period of onto- genesis. Material and methods: the research material includes 35 organocomplexes of fetal necks of both sexes from 19th to 22nd weeks of fetal development.Results. According to the study anteriorly from the thyroid gland there is loose connective tissue, which is thickest in the area of the right and left lobes. The thickness of connective tissue of the posterior surface of the lobes and the esophagus is bilaterally dif-ferent, due to the deviation of the cervical part of the esophagus to the left. The right and the left lobes of the thyroid gland are ap-proximately equidistant form the body of the cervical vertebra - 2,32±0,29 mm and 2.27±0.31 mm, respectively. The thyroid capsule is thickest in the isthmus area and equals 40,10 (25,10-40,00) mcm. In the abovementioned period of ontogenesis there is a pattern of follicle distribution in the thyroid parenchyma: the larger ones are located peripherally, the smaller ones are concentrated in the center of the lobes and the isthmus.Conclusion. The study allowed us to obtain new data on the macro- and microscopic structure of the thyroid gland in the intermediate fetal period of ontogenesis.