[Fetal structures of the lower jaw. Anterior sections and the condyle].

The aim of this work was to provide a comparative analysis of the evolution of the symphyseal and condylar zones, as observed in human fetuses. The behavior of cartilage was studied in both these sectors. In the anterior and anterolateral zone of mandible, one is able to distinguish the symphyseal corridor, Meckel's cartilage and derivatives, together with the following ossifications; enchondral (Meckel's cartilage), juxtaparachondral (specific to mandible), and enchondral originating from secondary cartilage. Characteristics of the various layers are evidenced at the condylar level, as reflected by the distribution and significance of the columns crossing the cartilage. We have shown in our previous research works that these present the same structure and the same staining characteristics as the layers of vascularized connective tissue. The latter is tissue-generating and moves from meniscus-related regions.