Popova I. Peculiarities of morphogenesis and topography of the infrahyoid triangles in anterior neck region during prenatal period of human ontogenesis

According to the results of our research, we propose consequence stages of neck formation as a part of the human body together with the formation of structures within infrahyoid triangles in the anterior cervical region: 1) early pharyngeal (3-4th week of IUD) – pharyngeal arches formation, curvature of the axis of the embryo; 2) late pharyngeal (4-6th weeks of IUD)- formation of the cervical sinus, formation infrahyoid precursor muscular plate; formation of a common precursor for SCM and trapezius muscles; formation of the early embryological models of the subcutaneous neck muscle and hyoid bone; 3) early prefetal (7-9th week of IUD) – separation of the rudiment for hyoid bone body; establishment of upper and lower topographical limits of the neck as a part of the human body; separation process of the infrahyoid muscles: sternohyoid, sternothyroid , thyrohyoid, omohyoid muscles; 4) late prefetal (10-12th weeks of IUD) – separation of the neck as a part of the embryo body; formation of separate, mature infrahyoid muscles of the neck with the corresponding fascial spaces and innervation; 5) fetal (4-10 months of IUD) – formation of topographic relationships within the anterior cervical triangle and fascial-cellular spaces, formation of the. omotracheal and carotid triangles of the neck.