| Fetal and infant growth patterns of the mandibular symphysis in modern humans and chimpanzees (Pan troglodytes). | |
| | |
MedLine Citation:
|
PMID: 20807267 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Comparison of the early development of the mandibular symphysis between primates and modern humans is of particular interest in human palaeontology. Using geometric morphometric methods, we explored and compared the ontogenetic shape changes of 14 chimpanzee mandibles (Pan troglodytes) against 66 human CT-scanned mandibles over the age range from fetal life to the complete emergence of the deciduous dentition in a visualization incorporating the deciduous tooth arrangement. The results reveal that the symphysis is anteriorly inclined in the youngest chimpanzee fetuses but develops an increasingly vertical orientation up until birth. At the same time, the anterior teeth reorient before a vertical emergence, and a symphyseal tuber appears on the labial side. When the deciduous canine emerges, the symphysis inclines anteriorly again, exhibiting the adult characteristic slope. These two phases are characterized by a repositioning of the simian shelf. Unlike chimpanzees, the human symphysis remains vertical throughout fetal development. However, the combination of morphological changes observed in chimpanzee fetuses is similar to that of modern humans after birth, as the mental region projects forward. By elongating the alveolar process, the inclination of the chimpanzee symphysis could be a key event for emergence of the deciduous canine, as space is lacking at the alveolar ridge in a vertical symphysis once the deciduous incisors and molars have emerged. The repositioning of the simian shelf suggests that the suprahyoid muscles have a significant influence on the anterior growth of the symphysis. The anteroposterior positioning of the basal symphysis in both species may be related to hyoid bone position during ontogeny. |
| | |
Authors:
|
Michael Coquerelle; Fred L Bookstein; José Braga; Demetrios J Halazonetis; Gerhard W Weber |
Related Documents
:
|
7971107 - Prospective control in catching by infants. 19500987 - Reconstructing the evolution of laughter in great apes and humans. 19328557 - Infants' responsiveness to pictorial depth cues in preferential-reaching studies: a met... 17339127 - The equality of quantity. 9143177 - A case control study of neonatal sepsis: experience from saudi arabia. 20925937 - Impact of maternal metabolic abnormalities in pregnancy on human milk and subsequent in... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-30 |
Journal Detail:
|
Title: Journal of anatomy Volume: 217 ISSN: 1469-7580 ISO Abbreviation: J. Anat. Publication Date: 2010 Nov |
Date Detail:
|
Created Date: 2010-10-28 Completed Date: 2011-02-03 Revised Date: 2013-02-19 |
Medline Journal Info:
|
Nlm Unique ID: 0137162 Medline TA: J Anat Country: England |
Other Details:
|
Languages: eng Pagination: 507-20 Citation Subset: IM |
Copyright Information:
|
© 2010 The Authors. Journal of Anatomy © 2010 Anatomical Society of Great Britain and Ireland. |
Affiliation:
|
Department of Anthropology, University of Vienna, Austria. michael.coquerelle@univie.ac.at |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Humans Infant Infant, Newborn Mandible / anatomy & histology, embryology*, growth & development* Pan troglodytes Tomography, X-Ray Computed Tooth / growth & development |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Real-time Virtual Sonography for navigation during targeted prostate biopsy using magnetic resonance...
Next Document: Quantitative morphometry of the orbit in Chinese adults based on a three-dimensional reconstruction ...