Early morphogenesis of the structures of the floor of the human oral cavity.

Abstract

The floor of the human oral cavity in the narrow, anatomical sense is a muscle- aponeurotic lamina, represented by mylohyoid, chin-tongue, genioglossus and their fascia. In a broad, topographical sense, it is a complex of soft tissues, which consists of muscles, fascia, salivary glands, blood and lymphatic vessels, lymph nodes, the anterior part of the tongue which are bound anteriorly and laterally by the inner surface of the mandible, and posteriorly by the anterior surface of the hyoid bone. The floor of the oral cavity is projected onto the region of the suprahyoid triangle of the neck, which serves as a place for surgical access to its structures. Understanding the morphogenesis and embryological transformations of the floor of the oral cavity during the intrauterine development (IUD) allows to create a morphological basis for the interpretation of the etiology of the congenital malformations of its structures. The aim of the study. To determine the peculiarities and chronology of the sources of the rudiments of the structures of the floor of the oral cavity in the embryonic period of human ontogenesis. Material and methods. Serial histological sections of 16 human embryos (4.0-13.0 mm parietal-coccygeal length) were studied using the methods of microscopy, three-dimensional reconstruction, morphometry and statistical analysis.