Masticatory Loading and Ossification of the Mandibular Symphysis during Anthropoid Origins.

Title

Masticatory Loading and Ossification of the Mandibular Symphysis during Anthropoid Origins.

Creator

Ravosa Matthew J; Vinyard Christopher J

Publisher

Scientific reports

Date

2020
2020-04-06

Description

An ossified or 'fused' mandibular symphysis characterizes the origins of the Anthropoidea, a primate suborder that includes humans. Longstanding debate about the adaptive significance of variation in this jaw joint centers on whether a bony symphysis is stronger than an unfused one spanned by cartilage and ligaments. To provide essential information regarding mechanical performance, intact adult symphyses from representative primates and scandentians were loaded ex vivo to simulate stresses during biting and chewing - dorsoventral (DV) shear and lateral transverse bending ('wishboning'). The anthropoid symphysis requires significantly more force to induce structural failure vs. strepsirrhines and scandentians with unfused joints. In wishboning, symphyseal breakage always occurs at the midline in taxa with unfused conditions, further indicating that an ossified symphysis is stronger than an unfused joint. Greater non-midline fractures among anthropoids suggest that fusion imposes unique constraints on masticatory function elsewhere along the mandible, a phenomenon likely to characterize the evolution of fusion and jaw form throughout Mammalia.

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Format

journalArticle

Search for Full-text

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Pages

5950

Issue

1

Volume

10

ISSN

2045-2322 2045-2322

NEOMED College

NEOMED College of Medicine

NEOMED Department

Department of Anatomy & Neurobiology

Update Year & Number

June 2020 Update II

Citation

Ravosa Matthew J; Vinyard Christopher J, “Masticatory Loading and Ossification of the Mandibular Symphysis during Anthropoid Origins.,” NEOMED Bibliography Database, accessed January 16, 2021, https://neomed.omeka.net/items/show/11068.

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