PubMed · 9555451
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
R Belkengren, S Sapala. Pediatric management problems. Plagiocephaly.. https://pubmed.ncbi.nlm.nih.gov/9555451/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Five discrete hypostotic cranial traits, tympanic dehiscence, ovale-spinosum confluence, metopism, transverse zygomatic suture vestige, and biasterionic suture, were investigated in 81 human population samples. Except for ovale-spinosum confluence, marked asymmetric occurrences of the bilateral traits were not detected in the majority of the samples. Significant intertrait association was observed mainly between the biasterionic suture and other sutural variations including accessory ossicles. The traits showing relatively consistent sex differences across diverse populations were tympanic dehiscence, which is predominant in females, and biasterionic suture in males. On a world scale, the 5 hypostotic cranial traits showed distinctive patterns of geographical variation. Different clinal variations within and between macrogeographical areas such as western and eastern parts of the Old World were found for the frequencies of the traits. The Ainu may be the most distinct outlier in the eastern Asian region on the basis of the incidence of the traits, especially the transverse zygomatic suture vestige. The interregional variation without reasonable adaptive value and nonadaptive shift of the possible outliers presented in this study suggest that the genetic background for the occurrence of these traits cannot be excluded completely.
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.
INTRODUCTION: The growth of the maxilla in man is still debated. Many authors described an anterior part of the maxillary bone, called premaxilla distinct from the maxilla proper. This description referred to the existence in animals of an incisive or premaxillary bone which does not exist in man. Is this distinction pertinent in the human facial growth? MATERIAL AND METHODS: To settle this question, we performed a histologic study in eight embryos and fetuses aged from 40 days to 10 weeks post conceptional (PC) and an anatomic dissection of 3 palates of fetuses aged from 22 to 30 weeks PC. RESULTS: We found only one maxillary point of ossification, and the growth of the anterior part of the maxilla cannot be separated from the global growth of the maxilla. DISCUSSION: The independence of the anterior part of the maxilla in man is very limited during the growth and cannot justify the term of premaxilla.