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Incisive Suture (Fissure) in the Human Fetus: Radiographic and Histologic Study

Objective: An anatomic study, in man, of the structure commonly known as the incisive suture (sutura incisiva) or incisive fissure has been performed to determine whether this structure belongs to the morphofunctional concept of a facial suture. Material: Eighteen palates of human fetuses of 9 weeks to 29 weeks after conception. Method: Anatomic, radiographic examination of the palate. Histologic study of sagittal and parasagittal sections of the palates (3 mm each). Results: The histologic aspect is that of a facial suture, with very poor vascularization. This suture is partial, limited laterally by osseous trabeculae. Conclusions: This particular suture, whose function in growth of the palatal process of the maxilla is discussed, could represent the phylogenetic vestige of the incisive-maxillary suture present in all nonhuman mammals.