Distinct growth of the nasomaxillary complex in Au. sediba
Author
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Lacruz, Rodrigo
Author
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Bromage, Timothy
Author
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O’Higgins, Paul
Author
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Toro Ibacache, María Viviana
Author
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Warshaw, Johanna
Author
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Berger, Lee
Admission date
dc.date.accessioned
2015-12-10T14:17:19Z
Available date
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2015-12-10T14:17:19Z
Publication date
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2015
Cita de ítem
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Scientific Reports | 5:15175
en_US
Identifier
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2045-2322
Identifier
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DOI: 10.1038/srep15175
Identifier
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https://repositorio.uchile.cl/handle/2250/135595
General note
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Artículo de publicación ISI
en_US
Abstract
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Studies of facial ontogeny in immature hominins have contributed significantly to understanding the evolution of human growth and development. The recently discovered hominin species Autralopithecus sediba is represented by a well-preserved and nearly complete facial skeleton of a juvenile (MH1) which shows a derived facial anatomy. We examined MH1 using high radiation synchrotron to interpret features of the oronasal complex pertinent to facial growth. We also analyzed bone surface microanatomy to identify and map fields of bone deposition and bone resorption, which affect the development of the facial skeleton. The oronasal anatomy (premaxilla-palate-vomer architecture) is similar to other Australopithecus species. However surface growth remodeling of the midface (nasomaxillary complex) differs markedly from Australopithecus, Paranthropus, early Homo and from KNM-WT 15000 (H. erectus/ergaster) showing a distinct distribution of vertically disposed alternating depository and resorptive fields in relation to anterior dental roots and the subnasal region. The ontogeny of the MH1 midface superficially resembles some H. sapiens in the distribution of remodeling fields. The facial growth of MH1 appears unique among early hominins representing an evolutionary modification in facial ontogeny at 1.9 my, or to changes in masticatory system loading associated with diet.
en_US
Patrocinador
dc.description.sponsorship
NIH/NIDCR
DE022799
Max Planck Research Award
Becas Chile grant