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Trabecular variation in the first metacarpal and manipulation in hominids

Dunmore, Christopher J., Bardo, Ameline, Skinner, Matthew M., Kivell, Tracy L. (2020) Trabecular variation in the first metacarpal and manipulation in hominids. American Journal of Physical Anthropology, 171 (2). pp. 219-241. ISSN 0002-9483. (doi:10.1002/ajpa.23974) (KAR id:79271)

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https://doi.org/10.1002/ajpa.23974

Abstract

Objectives: The dexterity of fossil hominins is often inferred by assessing the comparative manual anatomy and behaviors of extant hominids, with a focus on the thumb. The aim of this study is to test whether trabecular structure is consistent with what is currently known about habitually loaded thumb postures across extant hominids.

Results: Humans have significantly greater RBV/TV on the radiopalmar aspects of both the proximal and distal Mc1 subarticular surfaces and greater DA throughout the Mc1 head than other hominids. Nonhuman great apes have greatest RBV/TV on the ulnar aspect of the Mc1 head and the palmar aspect of the Mc1 base. Gorillas possessed significantly lower DA in the Mc1 head than any other taxon in our sample.

Discussion: These results are consistent with abduction of the thumb during forceful “pad‐to‐pad” precision grips in humans and, in nonhuman great apes, a habitually adducted thumb that is typically used in precision and power grips. This comparative context will help infer habitual manipulative and locomotor grips in fossil hominins.

Item Type: Article
DOI/Identification number: 10.1002/ajpa.23974
Uncontrolled keywords: first metacarpal, grip, hominid, manipulation, trabeculae
Subjects: G Geography. Anthropology. Recreation > GF Human ecology. Anthropogeography
Divisions: Divisions > Division of Human and Social Sciences > School of Anthropology and Conservation
Depositing User: Matthew Skinner
Date Deposited: 12 Dec 2019 09:23 UTC
Last Modified: 16 Feb 2021 14:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/79271 (The current URI for this page, for reference purposes)
Dunmore, Christopher J.: https://orcid.org/0000-0002-8634-9777
Bardo, Ameline: https://orcid.org/0000-0003-1840-6423
Skinner, Matthew M.: https://orcid.org/0000-0001-8321-3543
Kivell, Tracy L.: https://orcid.org/0000-0001-5087-0897
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