Cortical bone architecture of hominid intermediate phalanges reveals functional signals of locomotion and manipulation

dc.contributor.authorSyeda, Samar M.
dc.contributor.authorTsegai, Zewdi J.
dc.contributor.authorCasenave, Marine
dc.contributor.authorSkinner, Matthew M.
dc.contributor.authorKivell, Tracy L.
dc.date.accessioned2024-05-15T09:09:44Z
dc.date.available2024-05-15T09:09:44Z
dc.date.issued2024-05
dc.descriptionDATA AVAILABILITY STATEMENT : Copies of all scans are curated by the relevant curatorial institutions that are responsible for the original specimens and access can be requested through each institution. The authors confirm that the data supporting the findings of this study are available from the corresponding author upon reasonable request.en_US
dc.description.abstractOBJECTIVES : Reconstruction of fossil hominin manual behaviors often relies on comparative analyses of extant hominid hands to understand the relationship between hand use and skeletal morphology. In this context, the intermediate phalanges remain understudied. Thus, here we investigate cortical bone morphology of the intermediate phalanges of extant hominids and compare it to the cortical structure of the proximal phalanges, to investigate the relationship between cortical bone structure and inferred loading during manual behaviors. MATERIALS AND METHODS : Using micro-CT data, we analyze cortical bone structure of the intermediate phalangeal shaft of digits 2–5 in Pongo pygmaeus (n = 6 individuals), Gorilla gorilla (n = 22), Pan spp. (n = 23), and Homo sapiens (n = 23). The R package morphomap is used to study cortical bone distribution, cortical thickness and cross-sectional properties within and across taxa. RESULTS : Non-human great apes generally have thick cortical bone on the palmar shaft, with Pongo only having thick cortex on the peaks of the flexor sheath ridges, while African apes have thick cortex along the entire flexor sheath ridge and proximal to the trochlea. Humans are distinct in having thicker dorsal shaft cortex as well as thick cortex at the disto-palmar region of the shaft. DISCUSSION : Variation in cortical bone distribution and properties of the intermediate phalanges is consistent with differences in locomotor and manipulative behaviors in extant great apes. Comparisons between the intermediate and proximal phalanges reveals similar patterns of cortical bone distribution within each taxon but with potentially greater load experienced by the proximal phalanges, even in knuckle-walking African apes. This study provides a comparative context for the reconstruction of habitual hand use in fossil hominins and hominids.en_US
dc.description.departmentAnatomyen_US
dc.description.librarianhj2024en_US
dc.description.sdgSDG-03:Good heatlh and well-beingen_US
dc.description.sponsorshipH2020 European Research Council; HORIZON EUROPE Marie Sklodowska-Curie Actions.en_US
dc.description.urihttp://wileyonlinelibrary.com/journal/ajpaen_US
dc.identifier.citationSyeda, S. M., Tsegai, Z. J., Cazenave, M., Skinner, M. M., & Kivell, T. L. (2024). Cortical bone architecture of hominid intermediate phalanges reveals functional signals of locomotion and manipulation. American Journal of Biological Anthropology, 184(1), e24902. https://doi.org/10.1002/ajpa.24902.en_US
dc.identifier.issn2692-7691 (online)
dc.identifier.other10.1002/ajpa.24902
dc.identifier.urihttp://hdl.handle.net/2263/95978
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rights© 2024 The Authors. American Journal of Biological Anthropology published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License.en_US
dc.subjectCortical boneen_US
dc.subjectFunctional morphologyen_US
dc.subjectHominin manual behaviorsen_US
dc.subjectInternal bone structureen_US
dc.subjectPhalangeal morphologyen_US
dc.subject.otherHealth sciences articles SDG-03
dc.subject.otherSDG-03: Good health and well-being
dc.titleCortical bone architecture of hominid intermediate phalanges reveals functional signals of locomotion and manipulationen_US
dc.typeArticleen_US

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