INTRAUTERINE DEVELOPMENT OF THE HUMAN LOWER JAW

The aim – to determine the sources and terms of origin, developmental peculiarities anddynamics ossification mandible during prenatal period human ontogenesis.Materials methods. research was carried out on specimens 30 embryos and30 pre-fetuses from 9th 12th weeks intrauterinedevelopment, which were studied by microscopic examination. Three-dimensionalcomputer reconstructions pre-fetal head made.Results. During 7th week development maxillary processes at most approachthe lateral medial nasal ones; in 20,0 mm PCL they join frontal spindleforming facial structures (upper jaw lip, vestibule oral cavity, rudiments ofdental laminas, dental buds its distal portions). Osteogenous islets,rudiments mimic masticatory muscles, blood vessels are formed. 8thweek osseous tissue is formed, alveolar processesare cavities isolated 9-10-week mass increases both jaws, enamel organs aredetached, angles rami formed hyaline cartilaginous mandibleare determined, temporomandibular joints already seen. Duringthe 11th base jaws become To end ofthe begins replace cartilage mandibularrami, articular heads portion their proximal ends.Conclusions. known be characterized intracartilaginous formation bone starts ends graduallydisplaced tissue. It indicated that 37,0 42,0mm presented typical tissue, 45,0-50,0mm available replacing one.