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Comparative 3D quantitative analyses of trapeziometacarpal joint surface curvatures among living catarrhines and fossil hominins

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dc.contributor.author Marzke, Mary W. en
dc.contributor.author Tocheri, Matthew W. en
dc.contributor.author Steinberg, B. en
dc.contributor.author Femiani, J. D. en
dc.contributor.author Reece, S. P. en
dc.contributor.author Linscheid, R. L. en
dc.contributor.author Orr, Caley M. en
dc.contributor.author Marzke, R. F. en
dc.date.accessioned 2011-04-21T14:06:34Z
dc.date.available 2011-04-21T14:06:34Z
dc.date.issued 2010
dc.identifier.citation Marzke, Mary W., Tocheri, Matthew W., Steinberg, B., Femiani, J. D., Reece, S. P., Linscheid, R. L., Orr, Caley M., and Marzke, R. F. 2010. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F15859">Comparative 3D quantitative analyses of trapeziometacarpal joint surface curvatures among living catarrhines and fossil hominins</a>." <em>American Journal of Physical Anthropology</em>. 141 (1):38&ndash;51. en
dc.identifier.issn 0002-9483
dc.identifier.uri http://hdl.handle.net/10088/15859
dc.description.abstract Comparisons of joint surface curvature at the base of the thumb have long been made to discern differences among living and fossil primates in functional capabilities of the hand. However, the complex shape of this joint makes it difficult to quantify differences among taxa. The purpose of this study is to determine whether significant differences in curvature exist among selected catarrhine genera and to compare these genera with hominin1 fossils in trapeziometacarpal curvature. Two 3D approaches are used to quantify curvatures of the trapezial and metacarpal joint surfaces: (1) stereophotogrammetry with nonuniform rational B-spline (NURBS) calculation of joint curvature to compare modern humans with captive chimpanzees and (2) laser scanning with a quadric-based calculation of curvature to compare modern humans and wild-caught Pan, Gorilla, Pongo, and Papio. Both approaches show that Homo has significantly lower curvature of the joint surfaces than does Pan. The second approach shows that Gorilla has significantly more curvature than modern humans, while Pongo overlaps with humans and African apes. The surfaces in Papio are more cylindrical and flatter than in Homo. Australopithecus afarensis resembles African apes more than modern humans in curvatures, whereas the Homo habilis trapezial metacarpal surface is flatter than in all genera except Papio. Neandertals fall at one end of the modern human range of variation, with smaller dorsovolar curvature. Modern human topography appears to be derived relative to great apes and Australopithecus and contributes to the distinctive human morphology that facilitates forceful precision and power gripping, fundamental to human manipulative activities. Am J Phys Anthropol, 2010. © 2009 Wiley-Liss, Inc.1 The term ldquohomininrdquo refers to members of the tribe Hominini, which includes modern humans and fossil species that are related more closely to modern humans than to extant species of chimpanzees, Wood and Lonergan (2008). Hominins are in the family Hominidae with great apes. en
dc.relation.ispartof American Journal of Physical Anthropology en
dc.title Comparative 3D quantitative analyses of trapeziometacarpal joint surface curvatures among living catarrhines and fossil hominins en
dc.type Journal Article en
dc.identifier.srbnumber 81044
rft.jtitle American Journal of Physical Anthropology
rft.volume 141
rft.issue 1
rft.spage 38
rft.epage 51
dc.description.SIUnit NH-Anthropology en
dc.description.SIUnit NMNH en
dc.citation.spage 38
dc.citation.epage 51

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